Old Comedy is the first period of the ancient Greek comedy, according to the canonical division by the Alexandrian grammarians. The most important Old Comic playwright is Aristophanes – whose works, with their daring political commentary and abundance of sexual innuendo, de facto define the genre. The only extant plays of Old Comedy are credited to Aristophanes. There are only fragments and 'testimonia' of all other Old Comedy playwrights and plays.