Greek god of wine, ecstasy, theater, and death-rebirth. Twice-born — once from Semele's body before her death by lightning, once from Zeus's thigh after gestation. Foreign-arrival narrative (the god from Phrygia/Thrace coming back to Thebes) is the structural premise of Euripides's Bacchae and central to his cult-iconography. Greek tragedy and comedy were originally Dionysiac ritual.
Hes. Theog. 940-942 (son of Zeus and Semele); Eur. Bacch. 1-9 (Theban Semele struck by Zeus's thunderbolt; Dionysus saved and reborn from Zeus's thigh)