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Dionysus (Greek: Διόνυσος) is the Greek god of the grape harvest, winemaking, wine, ritual madness, fertility, theatre, and religious ecstasy. In Greek mythology, his heritage is disputed, being presented as a son of Zeus and the mortal Semele, thus semi-divine or heroic: and as son of Zeus and Persephone or Demeter, thus both fully divine, part-chthonic and possibly identical with Iacchus of the Eleusinian Mysteries. He is a major figure of Greek mythology and has been listed as one of the Twelve Olympians. His name, thought to be a theonym in Linear B tablets as di-wo-nu-so (KH Gq 5 inscription), shows that he may have been worshiped as early as c. 1500–1100 BC by Mycenean Greeks; other traces of the Dionysian-type cult have been found in ancient Minoan Crete. His origins are uncertain, and his cults took many forms; some are described by ancient sources as Thracian, others as Greek. Belief of Dionysus's festivals influenced the development of Greek theatre.