Hexameter is a literary and poetic form, a line consisting of six metrical feet, as in the Iliad. It was the standard epic metre in Greek and became standard for Latin too. It was also used in other types of composition -- in Horace's satires, for instance, and Ovid's Metamorphoses. In Greek mythology, hexameter was invented by Phemonoe.
The hexameter has never enjoyed a similar popularity in English, where the standard metre is iambic pentameter; however, various English poems have been written in hexameter over the centuries. There are numerous examples of iambic hexameter from the 16th century and a few from the 17th; the most prominent of these is Michael Drayton's Poly-Olbion (1612) in hexameter couplets. An example from Drayton:
Nor any other wold like Cotswold ever sped,
So rich and fair a vale in fortuning to wed.
In the 17th century the iambic hexameter, or alexandrine, was used as a substitution in the heroic couplet, and as one of the types of permissible lines in lyrical stanzas and the Pindaric odes of Cowley and Dryden.
In the late 18th century the hexameter was adapted to the Lithuanian language by Kristijonas Donelaitis. His poem "Metai" (The Seasons) is considered the most successful hexameter text in Lithuanian as yet.
Several attempts were made in the 19th century to naturalise the dactylic hexameter to English, by Henry Wadsworth Longfellow, Arthur Hugh Clough and others, none of them particularly successful. Gerard Manley Hopkins wrote many of his poems in six foot iambic and sprung rhythm lines. In the 20th century a loose ballad-like six-foot line with a strong medial pause was used by William Butler Yeats. The iambic six-foot line has also been used occasionally, and an accentual six-foot line has been used by translators from the Latin and many poets.
See also: Dactylic hexameter