The Crown of Violet
Geoffrey Trease1997

High up on a stone seat in the great open-air theatre of Athens, Alexis, son of Leon, watches the Festival of Plays - and dreams of seeing his own play on that famous stage.
So, as the summer passes, Alexis writes his play for the next year's Festival. But then, with his friend Corinna, he learns that Athens has enemies - enemies who do not like Athenian democracy, and who are planning a revolution to end it all...