Metamorphoses (Latin: Metamorphoseon libri: "Books of Transformations") is a Latin narrative poem by the Roman poet Ovid, considered his magnum opus. Comprising fifteen books and over 250 myths, the poem chronicles the history of the world from its creation to the deification of Julius Caesar within a loose mythico-historical framework. Although meeting the criteria for an epic, the poem defies simple genre classification by its use of varying themes and tones.