What did ancient Greek costumes, masks and theatre look like? Theater played an important role in ancient Greece. History of the Greek theatre started with festivals held in honor of their gods honoring their gods. A god, Dionysus, was honored with a festival called by "City Dionysia". In the days of Solon, people were often to be seen wandering around the streets during the festival of Di-o-ny´sus, god of wine. They were clad in goatskins, were smeared with the dregs of wine and d...