Demeter

Demeter is a greek goddess of harvest, agriculture, the cycle of life and death, and of the sacred law. She is mentioned in Skin Game.

Skin Game
In Skin Game, Hades mentions Hecate as leading Demeter around and around while searching for Persephone, allowing Hades and Persephone to enjoy their honeymoon without Persephone's mother around. It was her wedding gift to them.