Dionysus was the ancient Greek god of wine, winemaking, grape cultivation, fertility, ritual madness, theater, and religious ecstasy. His Roman name was Bacchus.
He may have been worshiped as early as 1500-11000 BCE by Mycenean Greeks.
As wine was a major part of ancient Greek culture, Dionysus was an important and popular figure in mythology. He was one of the twelve Olympians, although he was the last to arrive, and his unusual birth and upbringing marked him as an outsider.