An emperor (from the Latin "imperator") is a (male) monarch, usually the sovereign ruler of an empire or another type of imperial realm. Empress is the female equivalent. As a title, "empress" may indicate the wife of an emperor (empress consort) or a woman who rules in her own right (empress regnant). Emperors and Empresses are generally recognized to be above kings and queens in honour and rank.
Today the Emperor of Japan is the only remaining emperor on a throne in the world.
Both kings and emperors are monarchs. Within the European context, "emperor" and "empress" are considered the highest of monarchical titles, ironic in that "emperor" began as a military honorific in a staunchly anti-monarchical republic. Emperors were once given precedence over kings in international diplomatic relations; currently, precedence is decided by the length a head of state is continuously in office. Some emperors claimed inheritance (translatio imperii) of the political and religious authority of the Roman Emperors such as an important role in the state church; see Imperial cult and Caesaropapism. This inheritance has been claimed by, among others, the rulers of the Holy Roman Empire, the Byzantine Empire, and the Russian Empire; however, all types of monarchies have played religious roles; see divine right of kings and divine king. Territorial size was of no importance; the title was a conscious attempt by monarchs to link themselves to the institutions and traditions of the Romans as part of state ideology. In contrast, many republics have named a legislative chamber after the Roman Senate.
Outside the European context, "emperor" is a translation given to holders of titles who are accorded the same precedence as European emperors in diplomatic terms. In reciprocity, these rulers may accredit equal titles in their native languages to their European peers. Due to centuries of international convention, this has become the dominant rule to identifying an emperor in the modern era.
Also, historians have liberally used "emperor" and "empire" anachronistically and out of its Roman and European context to describe any large state and its ruler in the past and present. "Empire" became identified with vast territorial holdings rather than the title of its ruler by the mid-18th century. Voltaire sardonically described the Holy Roman Empire as "neither Holy, nor Roman, nor an Empire" since by his time it was little more than an informal association of German states and its "Emperor", though at Voltaire's time ruler of Austria and king of Hungary and Bohemia, had almost no authority within the non-Austrian parts of the territory.
In the Roman tradition a large variety in the meaning and importance of the imperial form of monarchy developed: in intention it was always the highest office, but it could as well fall down to a redundant title for nobility that had never been near to the "Empire" they were supposed to be reigning. Also the name of the position split in several branches of Western tradition, see below.
Importance and meaning of Coronation ceremonies and regalia also varied within the tradition: for instance Holy Roman Emperors could only be crowned emperor by the pope, which meant the coronation ceremony usually took place in Rome, often several years after these emperors had ascended to the throne (as "king") in their home country. The first Latin Emperors of Constantinople on the other hand had to be present in the newly conquered capital of their Empire, because that was the only place where they could be granted to become Emperor.
Early Roman Emperors avoided any type of ceremony or regalia different from what was already usual for 'republican' offices in the Roman Republic: the most intrusive change had been changing the color of their robe to 'purple'. Later new symbols of worldly and/or spiritual power, like the orb became an essential part of the Imperial accessories.
Rules for indicating successors also varied: there was a tendency towards male inheritance of the supreme office, but as well election by noblemen, as ruling Empresses (for empires not too strictly under salic law) are known. Ruling monarchs could additionally steer the succession by adoption, as often occurred in the two first centuries of Imperial Rome. Of course, intrigue, murder and military force could also mingle in for appointing successors, the Roman Imperial tradition made no exception to other monarchical traditions in this respect. Probably the epoch best known for this part of the Imperial tradition is Rome's third century rule.
When Republican Rome turned into a monarchy again, in the second half of the 1st century BC, at first there was no name for the title of the new type of monarch: ancient Romans abhorred the name Rex ("king"), and after Julius Caesar also Dictator (which was an acknowledged office in Republican Rome, Julius Caesar not being the first to hold it).
Augustus, who can be considered the first Roman Emperor, avoided naming himself anything that could be reminiscent of "monarchy" or "dictatorship". Instead, these first Emperors constructed their office as a complicated collection of offices, titles, and honours, that were consolidated around a single person and his closest relatives (while in the republic the "taking of turns", often in shared offices, had been the principle for passing on power). These early Roman emperors didn't need a specific name for their monarchy: they had enough offices and powers accumulated so that in any field of power they were "unsurpassable", and besides: it was clear who had supreme power. The supreme power could poison, exile, or try for treason any who did not obey.
As the first Roman Emperors did not rule by virtue of any particular republican or senatorial office, the name given to the office of "head of state" in this new monarchical form of government became different depending on tradition, none of these traditions consolidated in the early days of the Roman Empire:
After the problematic year 69, the Flavian Dynasty reigned for about half a century. The succeeding Nervan-Antonian Dynasty, ruling for most of the 2nd century, stabilised the Empire. This epoch became known as the era of the Five Good Emperors, and was followed by the short-lived Severan Dynasty.
During the Crisis of the 3rd century, Barracks Emperors succeeded one another at short intervals. Three short lived secessionist attempts had their own emperors: the Gallic Empire, the Britannic Empire, and the Palmyrene Empire though the latter used rex more regularly. The next period, known as the Dominate, started with the Tetrarchy installed by Diocletian.
Through most of the 4th century, there were separate emperors for the Western and Eastern part of the Empire. Although there were several dynastic relations between the Emperors of both parts, they also often were adversaries. The last Emperor to rule a unified Roman Empire was Theodosius. Less than a century after his death in 395, the last Emperor of the Western half of the Empire was driven out.
See main article: Byzantine Emperor.
Historians generally call the eastern part of the Roman Empire the Byzantine Empire due to its capital Constantinople, whose ancient name was Byzantium (now Istanbul). After the fall of Rome to barbarian forces in 476, the title of "emperor" lived on in rulers of Constantinople (New Rome).
The Byzantine Emperors completed the transition from the idea of the Emperor as a semi-republican official to the Emperor as a traditional monarch when Emperor Heraclius retained the title of Basileus, already a synonym for "Emperor" (but which had earlier designated "King" in Greek) in the first half of the seventh century. A specifically Byzantine development of emperor's position was cesaropapism, position as leader of Christians.
In general usage, the Byzantine imperial title evolved from simply "emperor" (basileus), to "emperor of the Romans" (basileus tōn Rōmaiōn) in the 9th century, to "emperor and autocrat of the Romans" (basileus kai autokratōr tōn Rōmaiōn) in the 10th. In fact, none of these (and other) additional epithets and titles had ever been completely discarded.
In 1204, the Fourth Crusade captured Constantinople, and soon established a Latin Empire of Constantinople under one of the Crusader leaders. The Latin Empire was, however, unable to consolidate control of the whole of the former territories of the Byzantine Empire. Driven out of Constantinople in 1261, some territories in Greece still recognized their authority for some time. Eventually, the Imperial title became redundant and did not even contribute any longer to the prestige of the noblemen in their own country: it remained dormant after 1383. It produced three reigning empresses, two of which reigned outside of the city in the remnants of their empire.
In Asia Minor, after being driven out of Constantinople, relations of the last pre-Crusader emperors established the Empire of Nicaea and the Empire of Trebizond. Similarly, the Despotate of Epirus was founded in the Western Balkans (the rulers of the latter took the title of Emperor for a short time following their conquest of Thessalonica in 1224).
Eventually, the Nicaean Emperors were successful in reclaiming the Byzantine imperial title. They managed to force Epirus into submission and retake Constantinople by 1261, but Trebizond remained independent. The restored Byzantine empire finally fell due to Ottoman invasion in 1453. The Trapezuntines produced three reigning empresses before they too were defeated by the Ottomans in 1461.
See main article: Holy Roman Emperor. The Roman of the Emperor's title was a reflection of the translatio imperii (transfer of rule) principle that regarded the (Germanic) Holy Roman Emperors as the inheritors of the title of Emperor of the Western Roman Empire, a title left unclaimed in the West after the death of Julius Nepos in 480.
From the time of Otto the Great onward, much of the former Carolingian kingdom of Eastern Francia became the Holy Roman Empire. The various German princes elected one of their peers as King of the Germans, after which he would be crowned as emperor by the Pope. The last emperor to be crowned by the pope was Charles V; all emperors after him were technically emperors-elect, but were universally referred to as Emperor.
In the face of aggressions by Napoleon, Francis feared for the future of the Holy Roman Empire and wished to maintain his and his family's Imperial status in the event that the Holy Roman Empire should be dissolved, as it indeed was in 1806 when Austrian-led army suffered a humiliating defeat at the Battle of Austerlitz and the victorious Napoleon proceeded to dismantle the old Reich by severing a good portion from the empire and turning it into a separate Confederation of the Rhine. With the size of his imperial realm significantly reduced, Francis II, Holy Roman Emperor became Francis I, Emperor of Austria.
See main article: German Empire. Under the guise of idealism giving way to realism, German nationalism rapidly shifted from its liberal and democratic character in 1848 to Prussian prime minister Otto von Bismarck's authoritarian Realpolitik. Bismarck wanted to unify the rival German states to achieve his aim of a conservative, Prussian-dominated Germany. Three wars led to military successes and helped to convince German people to do this: the Second war of Schleswig against Denmark in 1864, the Austro-Prussian War against Austria in 1866, and the Franco-Prussian War against the Second French Empire in 1870–71. During the Siege of Paris in 1871, the North German Confederation, supported by its allies from southern Germany, formed the German Empire with the proclamation of the Prussian king Wilhelm I as German Emperor in the Hall of Mirrors at the Palace of Versailles, to the humiliation of the French, who ceased to resist only days later.
After his death he was succeeded by his son Frederick III who was only emperor for 99 days. In the same year his son Wilhelm II became the third emperor with in a year. He was the last German emperor. After the empire's defeat in World War I the empire ceased to exist.
See main article: Emperor of Austria. The first Austrian Emperor was the last Holy Roman Emperor Francis II. In the face of aggressions by Napoleon, Francis feared for the future of the Holy Roman Empire and wished to maintain his and his family's Imperial status in the event that the Holy Roman Empire should be dissolved, as it indeed was in 1806 when Austrian-led army suffered a humiliating defeat at the Battle of Austerlitz and the victorious Napoleon proceeded to dismantle the old Reich by severing a good portion from the empire and turning it into a separate Confederation of the Rhine. With the size of his imperial realm significantly reduced, Francis II, Holy Roman Emperor became Francis I, Emperor of Austria. The new imperial title may have sounded less prestigious than the old one, but Francis' dynasty continued to rule from Austria and a Habsburg monarch was still an emperor (Kaiser), and not just merely a king (König), in name.
The title lasted just a little over one century until 1918, but it was never clear what territory constituted the "Empire of Austria". When Francis took the title in 1804, the Habsburg lands as a whole were dubbed the Kaisertum Österreich. Kaisertum might literally be translated as "emperordom" (on analogy with "kingdom") or "emperor-ship"; the term denotes specifically "the territory ruled by an emperor", and is thus somewhat more general than Reich, which in 1804 carried connotations of universal rule. Austria proper (as opposed to the complex of Habsburg lands as a whole) had been an Archduchy since the 15th century, and most of the other territories of the Empire had their own institutions and territorial history, although there were some attempts at centralization, especially between 1848 and 1859. When Hungary was given self-government in 1867, the non-Hungarian portions, although usually collectively called Austria, were officially known only as the "Kingdoms and Lands Represented in the Imperial Council (Reichsrat)". The title of Emperor of Austria and the associated Empire (if there was such) were both abolished at the end of the First World War in 1918, when German Austria became a republic and the other kingdoms and lands represented in the Imperial Council established their independence or adhesion to other states.
Byzantium's close cultural and political interaction with its Balkan neighbors Bulgaria and Serbia, and with Russia (Kievan Rus', then Muscovy) led to the adoption of Byzantine imperial traditions in all of these countries.
In 913 Simeon I of Bulgaria was crowned Emperor (Tsar) by the Patriarch of Constantinople and imperial regent Nicholas Mystikos outside of the Byzantine capital. In its final simplified form, the title read "Emperor and Autocrat of all Bulgarians and Romans" (Tsar i samodăržec na vsički bălgari i gărci in the modern vernacular). The "Roman" component in the Bulgarian imperial title indicateed both rulership over Greek speakers and the derivation of the imperial tradition from the Romans (represented by the "Roman" Byzantines).
Byzantine recognition of Simeon's imperial title was revoked by the succeeding Byzantine government. The decade 914 - 924 was spent in destructive warfare between Byzantium and Bulgaria over this and other matters of conflict. The Bulgarian monarch, who had further irritated his Byzantine counterpart by claiming the title "Emperor of the Romans" (basileus tōn Rōmaiōn), was eventually recognized, as "Emperor of the Bulgarians" (basileus tōn Boulgarōn) by the Byzantine Emperor Romanos I Lakapenos in 924. Byzantine recognition of the imperial dignity of the Bulgarian monarch and the patriarchal dignity of the Bulgarian patriarch was again confirmed at the conclusion of permanent peace and a Bulgarian-Byzantine dynastic marriage in 927. In the meantime, the Bulgarian imperial title may have been also confirmed by the Pope. The Bulgarian imperial title "Tsar" was adopted by all Bulgarian monarchs up to the fall of Bulgaria under Ottoman rule. 14th century Bulgarian literary compositions clearly denote the Bulgarian capital (Tărnovo) as a successor of Rome and Constantinople, in effect, the "Third Rome".
It should be noted that after Bulgaria obtained full independence from the Ottoman Empire in 1908, its monarch, who was previously styled "Knyaz", i.e Prince, took the traditional title of "Tsar", but was recognized internationally only as a King.
In 1345 the Serbian King Stefan Uroš IV Dušan proclaimed himself Emperor (Tsar) and was crowned as such at Skopje on Easter 1346 by the newly created Patriarch of Serbia, and by the Patriarch of Bulgaria and the autocephalous Archbishop of Ohrid. His imperial title was recognized by Bulgaria and various other neighbors and trading partners but not by the Byzantine Empire. In its final simplified form, the Serbian imperial title read "Emperor of Serbians and Greeks" (car srbljem i grkom in the modern vernacular). It was only employed by Stefan Uroš IV Dušan and his son Stefan Uroš V in Serbia (until his death in 1371), after which it became extinct. A half-brother of Dušan, Simeon Uroš, and then his son Jovan Uroš, claimed the same title, until the latter's abdication in 1373, while ruling as dynasts in Thessaly. The "Greek" component in the Serbian imperial title indicates both rulership over Greeks and the derivation of the imperial tradition from the Romans (represented by the "Greek" Byzantines).
In 1472, the niece of the last Byzantine emperor, Sophia Palaiologina, married Ivan III, grand prince of Moscow, who began championing the idea of Russia being the successor to the Byzantine Empire. This idea was represented more emphatically in the composition of the monk Filofej addressed their son Vasili III. After ending Muscovy's dependence on its Mongol overlords in 1480, Ivan III began the usage of the titles Tsar and Autocrat (samoderžec' ). His insistence on recognition as such by the emperor of the Holy Roman Empire since 1489 resulted in the granting of this recognition in 1514 by Emperor Maximilian I to Vasili III. His son Ivan IV emphatically crowned himself Tsar (Tsar) on 16 January, 1547. The word Tsar derives from Latin Caesar,but this title was used in Russia as equivalent to King; the error occurred when medieval Russian clerics referred to the biblical Jewish kings with the same title that was used to designate Roman and Byzantine rulers - Caesar.
On 31 October, 1721 Peter I was proclaimed Emperor by the Senate-the title used was Latin "Imperator", which is a westernizing form equivalent to the traditional Slavic title "Tsar". He based his claim partially upon a letter discovered in 1717 written in 1514 from Maximilian I to Vasili III, Sophia's son and Ivan IV's father, in which the Holy Roman Emperor used the term in referring to Vasili. The title has not been used in Russia since the abdication of Emperor Nicholas II on 15 March, 1917.
Imperial Russia produced four reigning Empresses, all in the eighteenth century.
Ottoman rulers held several titles denoting their Imperial status. These included:
Sultan (given name) Khan, Sovereign of the Imperial House of Osman, Sultan of Sultans, Khan of Khans, Commander of the Faithful and Successor of the Prophet of the Lord of the Universe (Caliph), Protector of the Holy Cities of Mecca, Medina and Jerusalem, Emperor of The Three Cities of Constantinople, Andrinopole and Bursa, and of the Cities of Damascus and Cairo, of all Azerbaijan, of the Magris, of Barka, of Kairuan, of Aleppo, of Arabic Iraq and of Ajim, of Basra, of El Hasa, of Dilen, of Raka, of Mosul, of Parthia, of Diyarbakır, of Cicilia, of the Vilayets of Erzurum, of Sivas, of Adana, of Karaman, Van, of Barbary, of Abyssinia, of Tunisia, of Tripoli, of Damascus, of Cyprus, of Rhodes, of Candia, of the Vilayet of the Morea, of the Marmara Sea, the Black Sea and also its coasts, of Anatolia, of Rumelia, Baghdad, Kurdistan, Greece, Turkistan, Tartary, Circassia, of the two regions of Kabarda, of Georgia, of the plain of Kypshak, of the whole country of the Tartars, of Kefa and of all the neighbouring countries, of Bosnia and its dependencies, of the City and Fort of Belgrade, of the Vilayet of Serbia, with all the castles, forts and cities, of all Albania, of all Iflak and Bogdania, as well as all the dependencies and borders, and many other countries and cities.
Upon the conquering of the Roman Empire, the additional title of Kasar-i-Rum (Emperor of the Romans) was used.
The kings of the Ancien Régime and the July Monarchy used the title Empereur de France in diplomatic correspondence and treaties with the Ottoman emperor from at least 1673 onwards. The Ottomans insisted on this elevated style while refusing to recognize the Holy Roman Emperors or the Russian tsars due to their rival claims of the Roman crown. In short, it was an indirect insult by the Ottomans to the HRE and the Russians. The French kings also used it for Morocco (1682) and Persia (1715).
See also: First French EmpireNapoleon Bonaparte who was already First Consul of the French Republic (Premier Consul de la République française) for life, declared himself Emperor of the French (Empereur des Français) on May 18, 1804. Despite being ruled by an emperor, it continued to be the French Republic (République Française) until 1808, when it was renamed the French Empire (Empire Français).
Napoleon relinquished the title of Emperor of the French on 6 April and again on April 11, 1814.Napoleon's infant son, Napoleon II, was recognized by the Council of Peers, as Emperor from the moment of his father's abdication, and therefore reigned (as opposed to ruled) as Emperor for fifteen days, June 22 to July 7 of 1815.
Since 3 May 1814, the Sovereign Principality of Elba was created a miniature non-hereditary Monarchy under the exiled French Emperor Napoleon I. Napoleon I was allowed, by the treaty of Fontainebleau with (27 April), to enjoy, for life, the imperial title. The islands were not restyled an empire.
On 26 February 1815, Napoleon abandoned Elba for France, reviving the French Empire for a Hundred Days; the Allies declared an end to Napoleon's sovereignty over Elba on 25 March 1815, and on 31 March 1815 Elba was ceded to the restored Grand Duchy of Tuscany by the Congress of Vienna. After his final defeat, Napoleon was treated as a general by the British authorities during his second exile to Atlantic Isle of St. Helena. His title was a matter of dispute with the governor of St Helena, who insisted on addressing him as "General Bonaparte", despite the "historical reality that he had been an emperor" and therefore retained the title.  
See also: Second French EmpireNapoleon I's nephew, Napoleon III, resurrected the title of emperor on December 2, 1852, after establishing the Second French Empire in a presidential coup, subsequently approved by a plebiscite. His reign was marked by large scale public works, the development of social policy, and the extension of France's influence in Asia. He was deposed on September 4, 1870, after France's defeat in the Franco-Prussian War. The Third Republic followed and after the death of his son Napoleon IV, in 1879 during the Zulu War, the Bonapartist movement split, and the Third Republic was to last until 1940.
The origins of the title Imperator totius Hispaniae (Latin for Emperor of All Spain) is murky. It was associated with the Leonese monarchy perhaps as far back as Alfonso the Great (r. 866-910). The last two kings of its Pérez Dynasty were called emperors in a contemporary source.
King Sancho III of Navarre conquered Leon in 1034 and began using it. His son, Ferdinand I of Castile also took the title in 1039. Ferdinand's son, Alfonso VI of Castile took the title in 1077. It then passed to his son-in-law, Alfonso I of Aragon in 1109. His stepson and Alfonso VI's grandson, Alfonso VII was the only one who actually had an imperial coronation in 1135.
The title was not exactly hereditary but self proclaimed by those who had, wholly or partially, united the Christian northern part of the Iberian peninsula, often at the expense of killing rival siblings. The popes and Holy Roman emperors protested at the usage of the imperial title as a usurpation of leadership in western Christendom. After Alfonso VII's death in 1157, the title was abandoned.
After the fall of the Byzantine Empire, the legitimate heir to the throne, Andreas Palaiologos, willed away his claim to Ferdinand and Isabella in 1503. This claim seems to have been forgotten or abandoned quietly for the last 300 years.
See main article: British Emperor. In the late 3rd century, by the end of the epoch of the barracks emperors in Rome, there were two Britannic Emperors, reigning for about a decade. After the Roman departure from Britain, the Imperator Cunedda forged the Kingdom of Gwynedd in northern Wales, but all his successors were titled kings and princes.
There was no set title for the king of England before 1066 and monarchs chose to style themselves as they pleased. Imperial titles were used inconsistently beginning with Athelstan in 930 and ended with the Norman conquest of England.
In 1801, George III rejected the title of Emperor when offered. The only period when British monarchs were given the title of Emperor in a dynastic succession started when the title Empress of India was created for Queen Victoria. The government led by Prime Minister Benjamin Disraeli, conferred the additional title upon her by an Act of Parliament; it was also formally justified as the expression of Britain succeeding as paramount ruler of the subcontinent the former Mughal 'Padishah of Hind', using indirect rule through hundreds of princely states formally under protection, not colonies, but accepting the British Sovereign as their 'feudal' suzerain. That title was relinquished by the last Kaisar-i-Hind George VI when India was granted independence on August 15 1947.
Two decades earlier the Royal and Parliamentary Titles Act 1927 had stated that the United Kingdom and the dominions were "equal in status, in no way subordinate one to another in any aspect of their domestic or external affairs, though united by common allegiance to the Crown, and freely associated as members of the British Commonwealth of Nations". Along with the Statute of Westminster, 1931 this changed the way the British parliamentary monarchy ruled the overseas dominions, moving from a colonial British Empire towards a new structure for the interaction between the Commonwealth Realms and the Crown.
The last Empress of India was HM Queen Elizabeth, The Queen Mother.
When Napoleon I ordered the invasion of Portugal in 1807 because it refused to join the Continental System, the Portuguese Braganças moved their capital to Rio de Janeiro to avoid the fate of the Spanish Bourbons (Napoleon I arrested them and made his brother King). When General Junot (French) arrived in Lisbon, the Portuguese fleet had already left with all the local elite.
In 1808, under a British naval escort, the fleet arrived in Brazil. Later, in 1815, the Portuguese Prince Regent (since 1816 king John VI) proclaimed the United Kingdom of Portugal, Brazil and the Algarve, as a union of three kingdoms, lifting Brazil from its colonial status.
After the fall of Napolean I and the Liberal revolution in Portugal, the Portuguese Royals returned to Europe (1820). Prince Peter of Braganza (King John’s older son) stayed in South America acting as regent of the local kingdom, but, two years later in 1822, he proclaimed himself Peter I, first Emperor of Brazil. He did, however, recognize his father, John VI, as Titular Emperor of Brazil - a purely honorific title - until John VI's death in 1826.
The empire came to an end in 1889, with the overthrow of Emperor Pedro II (Pedro I's son and successor), when the Brazilian republic was proclaimed.
Haiti was declared an empire by its ruler, Jean-Jacques Dessalines, who made himself Jacques I, in 20 May, 1805. He was assassinated the next year. Haiti again became an empire from 1849 to 1859 under Faustin Soulouque.
In Mexico, the First Mexican Empire was the first of two empires created. Agustín de Iturbide, the general who helped secure Mexican independence from Spanish rule, was proclaimed Emperor Agustín I in 12 July, 1822, but was overthrown the next year.
In 1863, the invading French, under Napoleon III (see above), in alliance with Mexican conservatives, helped create the Second Mexican Empire, and invited Archduke Maximilian, of the house of Habsburg-Lorraine, younger brother of the Austrian Emperor Franz Josef I, to become emperor Maximilian I of Mexico. The childless Maximilian and his consort Empress Carlota of Mexico, daughter of Leopold I of Belgium, adopted Agustín's grandson as his heir to bolster his claim to the throne of Mexico. Maximilian and Carlota made Chapultepec Castle their home, which was the only palace in North America to house soveriegns. After the withdrawal of French protection in 1867, Maximilian was captured and executed by liberal forces. This empire led to French influence in the Mexican culture and also immigration from France, Belgium, and Switzerland to Mexico.
The Aztec and Inca traditions are unrelated to one another. Both were conquered under the reign of King Charles I of Spain who was simultaneously emperor-elect of the Holy Roman Empire during the fall of the Aztecs and fully emperor during the fall of the Incas. Incidentally by being king of Spain, he was also Roman (Byzantine) emperor in pretence through Andreas Palaiologos. The translations of their titles were provided by the Spanish.
The only pre-Columbian North American rulers to be commonly called emperors were the Hueyi Tlatoani of the Aztec Empire (1375 - 1521). It was an elected monarchy chosen by the elite. Spanish conquistador Hernán Cortés slew Emperor Cuauhtémoc and installed puppet rulers who became vassals for Spain. Mexican Emperor Maximilian built his palace, Chapultepec Castle, over the ruins of an Aztec one.
The only pre-Columbian South American rulers to be commonly called emperors were the Sapa Inca of the Inca Empire (1438 - 1533). Spanish conquistador Francisco Pizarro, conquered the Inca for Spain, killed Emperor Atahualpa, and installed puppets as well. Atahualpa may actually be considered a usurper as he had achieved power by killing his half-brother and he did not perform the required coronation with the imperial crown mascaipacha by the Huillaq Uma (high priest).
In Persia, from the time of Darius the Great, Persian rulers used the title "King of Kings" (Shahanshah in modern Iranian) since they had dominion over peoples from India to Greece. Alexander the Great probably crowned himself shahanshah after conquering Persia, bringing the phrase basileus toon basileoon to Greek. It is also known that Tigranes the Great, king of Armenia, was named as the king of kings when he made his empire after defeating the Parthians.
The last shahanshah was ousted in 1979 following the Iranian Revolution. Shahanshah is usually translated as king of kings or simply king for ancient rulers of the Achaemenid, Arsacid, and Sassanid dynasties, and often shortened to shah for rulers since the Safavid dynasty in the 16th century.
The Sanskrit word for emperor is Samrāṭ or Chakravarti(word stem: samrāj). This word has been used as an epithet of various Vedic deities, like Varuna, and has been attested in the Holy Rig Veda, possibly the oldest compiled book among the Indo-Europeans. Chakravarti refers to the king of kings. A Chakravarti is not only a sovereign ruler but also has feudatories.
Typically, in the later Vedic age, a Hindu king (Maharajah) was only called Samrāṭ after performing the Vedic Rājasūya sacrifice, enabling him by religious tradition to claim superiority over the other kings and princes. Another word for emperor is sārvabhaumā. The title of Samrāṭ has been used by many rulers of the Indian subcontinent as claimed by the Hindu mythologies. In proper history, most historians call Chandragupta Maurya the first samrāṭ (emperor) of the Indian subcontinent, because of the huge empire he ruled. The most famous Hindu emperor was his grandson Ashoka the Great. Other dynasties that are considered imperial by historians are the Kushanas, Guptas, Vijayanagara, Hoysala and the Cholas.
After India was invaded by the Mongol Khans and Turkic Muslims, the rulers of their major states on the subcontinent were titled Sultān, In this manner, the only empress-regnant ever to have actually sat on the throne of Delhi was Razia Sultan. For the episode from 1877 to 1947 when British Emperors ruled colonial India as the pearl in the crown of the British Empire, see above.
See main article: Emperor of Ethiopia. In Ethiopia, the Solomonic dynasty used, beginning in 1270, the title of "" which is literally "King of Kings". The use of the king of kings style began a millennium earlier in this region, however, with the title being used by the Kings of Aksum, beginning with Sembrouthes in the 3rd century. Another title used by this dynasty was "Itegue Zetopia".
"Itegue" translates as Empress, and was also used by the only female reigning Empress, Zauditu, along with the official title Negiste Negest (Queen of Kings).
In 1936, the Italian king Victor Emmanuel III claimed the title of Emperor of Ethiopia after Ethiopia was occupied by Italy during the Second Italo-Abyssinian War. After the defeat of the Italians by the British in 1941, Haile Selassie was restored to the throne but Victor Emmanuel did not relinquish his claim to the title until 1943.
The Rastafari claimed Selassie as God incarnate before and even more so after the Second World War (see Rastafari movement) which he did not endorse, though he was sympathetic. He was deposed in 1974, the imperial title ending the next year when his son, who had succeeded him, was deposed and exiled.
In 1976, President Jean-Bédel Bokassa of the Central African Republic, proclaimed the country to be an autocratic Central African Empire, and made himself Emperor as Bokassa I. The expenses of his coronation ceremony actually bankrupted the country. He was overthrown three years later and the republic was restored.
See main article: Emperor of China. The East Asian tradition is different from the Roman tradition, having arisen separately. What links them together is the use of the Chinese logographs 皇 (huáng) and 帝 (dì) which together or individually are imperial. Due to the cultural influence of China, China's neighbors adopted these titles or had their native titles conform in hanzi.
In 221 BC, Ying Zheng, who was king of Qin at the time, proclaimed himself shi huangdi (始皇帝), which translates as "first emperor". Huangdi is composed of huang ("august one", 皇) and di ("sage-king", 帝), and referred to legendary/mythological sage-emperors living several millennia earlier, of which three were huang and five were di. Thus Zheng became Qin Shi Huang, abolishing the system where the huang/di titles were reserved to dead and/or mythological rulers. Although not as popular, the title 王 wang (king or prince) was still used by many monarchs and dynasties in China up to the Taipings in the 19th century. 王 is pronounced vuong in Vietnamese, ō in Japanese, and wang in Korean.
The imperial title continued in China until the Qing Dynasty was overthrown in 1912. The title was briefly revived from December 12, 1915 to March 22, 1916 by President Yuan Shikai and again in early July, 1917 when General Zhang Xun attempted to restore last Qing emperor Puyi to the throne. Puyi retained the title and attributes of a foreign emperor, as a personal status, until 1924. After the Japanese occupied Manchuria in 1931, they proclaimed it to be the Empire of Manchukuo, and Puyi became emperor of Manchukuo. This empire ceased to exist when it was occupied by Soviet troops in 1945.
In general, an emperor would have one empress (Huanghou, 皇后) at one time, although posthumous entitlement to empress for a concubine was not uncommon. The earliest known usage of huanghou was in the Han Dynasty. The emperor would generally select the empress from his harem. In subsequent dynasties, when the distinction between wife and concubine became more accentuated, the crown prince would have chosen an empress-designate before his reign. Imperial China produced only one reigning empress, Wu Zetian, and she used the same Chinese title as an emperor (Huangdi, 皇帝). Wu Zetian then reigned for about 15 years.
See main article: Emperor of Japan.
In some countries in the Ancient Japan, the earliest titles for the sovereign were either ヤマト大王/大君 (yamato ōkimi, Grand King of Yamato), 倭王/倭国王 (waō/wakokuō, King of Wa, used externally), or 治天下大王 (amenoshita shiroshimesu ōkimi, Grand King who rules all under heaven, used internally). As early as the 7th century the word 天皇 (which can be read either as sumera no mikoto, divine order, or as tennō, Heavenly Emperor, the latter being derived from a Tang Chinese term referring to the Pole star around which all other stars revolve) began to be used. The earliest attested use of this term is on a wooden slat, or mokkan, that was unearthed in Asuka-mura, Nara Prefecture in 1998 and dated back to the reign of Emperor Temmu and Empress Jitō. The reading 'Tennō' has become the standard title for the sovereign of Japan up to and including the present age. The term 帝 (mikado, Emperor) is also found in literary sources.
Japanese monarchs placed themselves from 607 on equal footing with Chinese emperors in titulary terms, but rarely was the Chinese-style "Son of Heaven" term used. In the Japanese language, the word tennō is restricted to Japan's own monarch; kōtei (皇帝) is used for foreign emperors. Historically, retired emperors have kept power over a child-emperor as de facto Regent. For a fairly long time, a shōgun (formally the imperial generalissimo, but made hereditary) or regent wielded actual political power. In fact, through much of Japanese history, the emperor has been little more than a figurehead.
After World War II, all claims of divinity were dropped (see Ningen-sengen). Parliamentary government has wielded the power, reducing the office of emperor again to a mere ceremonial function. By the end of the 20th century, Japan was the only country with an emperor on the throne.
As of the early 21st century, Japan's succession law prohibits a female from ascending the throne. With the birth of a daughter as the first child of the current Crown Prince, Naruhito, Japan considered abandoning that rule. However, shortly after the announcement that Princess Kiko was pregnant with her third child, the proposal to alter the Imperial Household Law was suspended by Prime Minister Junichiro Koizumi. On January 3, 2007, after the birth of her son, Prince Hisahito, Prime Minister Shinzo Abe announced that he would drop the proposal.
Currently, many believe the new prince of Japan will ascend the throne, as the law defines. Historically, Japan has had eight reigning empresses who used the genderless title Tennō, rather than the female consort title kōgō (皇后) or chūgū (中宮). There is ongoing discussion of the Japanese Imperial succession controversy.Although current Japanese law prohibits female succession, all Japanese emperors claim to trace their lineage to Amaterasu, the Sun Goddess of the Shintō religion.
Although the Vietnamese rulers acknowledged the supremacy of China, and were known to the Chinese emperors as simply King of Annam (An Nam quốc vương) but some of them still proclaimed the title hoàng đế such as Lý Bí (Lý Nam Đế), Nguyễn Huệ (Quang Trung hoàng đế) ; and many others was given this title by their successors posthumously. In 1806, they took on a full Chinese-style imperial regalia domestically and have inconsistently used the title hoàng đế for a century though many were raised to that status posthumously so as not to antagonize relations with China. Axis-occupied Vietnam was declared an empire by the Japanese in March 1945. The line of emperors came to an end with Bảo Đại, who was deposed after the war, although he later served as head of state of South Vietnam from 1949 to 1955.
See main article: List of Korean monarchs.
The rulers of Goguryeo used the title of Taewang (Hangul: 태왕, hanja:太王), literally translated as the Greatest of the Kings but often to signify emperor. The rulers of Baekje and Silla used the title (Hangul: 대왕, hanja: 大王) which means "Great King".
Rulers of the Goryeo Dynasty (from Gwangjong onward) took the title of emperor as a means of enhancing the prestige of the monarchy. The title was relinquished in the 13th century, however, after the agreement of peace with the Mongols, when the Korean rulers were pressured into use the title of Kings and as such tributary ally of Kublai Khan's China-based Mongol Yuan Dynasty.
Following the Chinese defeat by Japan in 1895, Korea declared its total independence from China (see Treaty of Shimonoseki) and King Gojong took the title of Daehan Hwangje, (Hangul: 대한황제, translated as "Emperor of Great Han"). Emperor Gojong also adopted the Yeonho (연호 era name, of Gwangmu (Hangul: 광무, Hanja: 光武, meaning "Warrior of Light") on 1 January 1896. The full style of the ruler (7 January 1895 - 12 October 1897) called Daegunju Pyeha ("His Majesty the Great Monarch"), Joseon Guk-wang ("King of the Joseon State"). In the Korean Empire, since 12 October 1897, the full imperial style was Daehan Hwangje ("Emperor of Great Korean").
The title Khagan (khan of khans or grand khan) was held by Genghis Khan, founder of the Mongol Empire in 1206. The empire fragmented since the early 1260s, though the emperors of the Yuan dynasty in China (who also took the Chinese title huangdi, or Chinese emperor) were later seen as nominal Great Khans by the Mongol khanates to the west. Only the Khagans from Genghis Khan to the fall of the Yuan dynasty in China in 1368 are normally referred to as Emperors in English.
There have been many fictional emperors in movies and books. To see a list of these emperors, see Category of fictional emperors and empresses.