The Castle of Perseverance is a c. 15th-century morality play and the earliest known full-length (3,649 lines) vernacular play in existence. Along with Mankind and Wisdom, The Castle of Perseverance is preserved in the Macro Manuscript (named after its owner Cox Macro) that is now housed in the Folger Shakespeare Library in Washington, D.C. The Castle of Perseverance contains nearly all of the themes found in other morality plays, but it is especially important (and unusual) because a stage drawing is included, which may suggest theatre in the round.