Blank verse
Blank verse is poetry written with regular metrical but unrhymed lines, usually in iambic pentameter. It has been described as "probably the most common and influential form that English poetry has taken since the 16th century," and Paul Fussell has estimated that "about three quarters of all English poetry is in blank verse." The first known use of blank verse in English was by Henry Howard, Earl of Surrey in his translation of the Aeneid (composed c. 1540; published posthumously, 1554–1557).