After the Great Destruction of Athens by the Persian Empire in 480 BC, the town and acropolis were rebuilt, and theatre became an even more major part of Athenian culture and civic pride. The centre-piece was the competition between three tragic playwrights at the Theatre of Dionysus, twice a year. Each submitted three tragedies, plus a satyr play (a comic, burlesque version of a mythological subject). From 486 BC, each playwright also submitted a comedy. Aristotle claimed that Aeschylus added the second actor, and that Sophocles introduced the third. Apparently the Greek playwrights never used more than three actors.