Ariadne was the Minoan princess who saved Theseus from the Minotaur. They sailed off together and spent the night on the island of Naxos where he had sex with her and then slipped off to continue his voyage to Athens before she awoke. Different versions of the myth give different reasons. Ariadne, had alienated her father by thwarting the Minotaur and running off so going home was not an option. Dionysos found her and awoke her and took her to be his own wife. Ariadne, like Utena, has a name invoking divinitiy although I have seen conflicting etymologies. In any case the Greek word for god is embedded in the name Dionysos.

Dionysos himself is a very contradictory and dualistic character. Some myths characterize him as an outsider or even a foreigner. His mythological followers are crazed with sex and violence (maenads and satyrs) and tear wild animals to pieces with their bare hands. In one story he manipulates one of his enemies into being torn apart by the maenads. Dionysos is both Human and Divine and has aspects of a god who dies and is resurrected; for example in the way grapes turn into wine. As with wine he is wonderful in small doses, deadly in large doses. Early Christians pointed to him as a pre-cursor of Christ. He can travel to Hades safely and bring people back. Dionysos is a patron of drama and of liberation from convention.

In general Classical Greek mythology is misogynistic so there are distinct limits to how useful it is as a precursor to RGU. I don't know if Be-Papas meant for Dios to be Dionysos but if they know about a obscure goddess like Antheia they surely are familiar with Dionysos.

Yeah, I can't remember anything specific other than Ariadne myself. But there is a definite long term literary theme regarding the maenad that casts Dionysus as a sort of empowerer of women.  As brian points out, it's a dualism, because there's the despoiler of women element, too.