- (1) see Dionysus. (2) What has that to do with Bacchus? An old catchphrase meaning 'What has that got to do with it?' According to legend, Thespis founded the Greek drama by introducing recitations into the Bacchic vintage songs. This was considered acceptable as long as his speeches dealt with the exploits of Bacchus. However, when he ventured onto other subjects, the audience pulled him up with the exclamation, "What has that to do with Bacchus?"