Gwydion

God of war. Celtic (Welsh). His mother is DON the Welsh mother goddess. He allegedly caused a war between Gwynedd and Dyfed. He visited the court of PRYDERI, son of RHIANNON, in Dyfed, and stole his pigs. In the ensuing combat Gwydion used magic powers and slew Pryderi. He seems to have underworld links, hence the route taken by the dead, the Milky Way, was named Caer Gwydion.

Arawn

Chthonic underworld god. Celtic (Welsh). The leader of the phantom hunt seen chasing a white stag with a pack of red-eared hounds. He equates with GWYNN AP NUDD, a similar deity known in South Wales. His chief underworld opponent is Hafgan and he bribes PWYLL, prince of Dyfed, to challenge Hafgan in exchange for a gift of pigs.