Cwn Annwn

In Welsh mythology and folklore, Cŵn Annwn, singular Ci Annwn, were the spectral hounds of Annwn, the otherworld of Welsh myth. They were associated with a form of the Wild Hunt, presided over by either Arawn, king of Annwn in Pwyll Pendefig Dyfed, the First Branch of the Mabinogi and alluded to in Math fab Mathonwy the Fourth Branch of the Mabinogi, or by Gwyn ap Nudd as the underworld king and king of the fair(y) folk is named in later medieval lore.