In ancient Greek religion and myth, Dionysus is the god of wine-making, orchards and fruit, vegetation, fertility, festivity, insanity, ritual madness, religious ecstasy, and theatre. He was also known as Bacchus by the Greeks for a frenzy he is said to induce called baccheia. As Dionysus Eleutherius, his wine, music, and ecstatic dance free his followers from self-conscious fear and care, and subvert the oppressive restraints of the powerful. His thyrsus, a fennel-stem sceptre, sometimes wound with ivy and dripping with honey, is both a beneficent wand and a weapon used to destroy those who oppose his cult and the freedoms he represents. Those who partake of his mysteries are believed to become possessed and empowered by the god himself.

Orphism is the name given to a set of religious beliefs and practices originating in Thrace and later spreading to the ancient Greek and Hellenistic world, associated with literature ascribed to the mythical Thracian poet Orpheus, who descended into the Greek underworld and returned. This type of journey is called a katabasis and is the basis of several hero worships and journeys. Orphics revered Dionysus and Persephone. Orphism has been described as a reform of the earlier Dionysian religion, involving a re-interpretation or re-reading of the myth of Dionysus and a re-ordering of Hesiod's Theogony, based in part on pre-Socratic philosophy.