Dionysos (or Dionysus, also Roman Bacchus) is the Greek god of wine, fertility, ecstasy, ritual madness, and theatre, known for freeing people from inhibitions through revelry, music, and dance, with his worship involving ecstatic rites led by Maenads. Born from Zeus and the mortal Semele, he is called the "twice-born" because Zeus sewed him into his thigh after Semele's death, completing his gestation. He symbolizes the wild, untamed aspects of nature and human spirit, contrasting with Apollo's order.