Bacchus/DionysusDionysus (/daɪ.əˈnaɪsəs/; Greek: Διόνυσος) is the god of the grape-harvest, winemaking and wine, of fertility, orchards and fruit, vegetation, insanity, ritual madness, religious ecstasy, festivity and theatre in ancient Greek religion and myth. He is also known as Bacchus (/ˈbækəs/ or /ˈbɑːkəs/; Greek: Βάκχος, Bákkhos), the name adopted by the Romans; the frenzy he induces is bakkheia.