Blank verse is poetry written with regular metrical but unrhymed lines, almost always 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 play Arden of Faversham (around 1590 by an unknown author) is a notable example of end-stopped blank verse.