In 566 BCE, Pisistratus, the tyrant of the city (which was not yet a democracy), instituted a civic and religious festival, the Panathenaia, which included a poetic competition, featuring performances of the Homeric poems. The institution is particularly significant because we are told that the Homeric poems had to be performed “correctly,” which implies the canonization of a particular written text of The Iliad and The Odyssey at this date.
