In Welsh mythology, Rhiannon is a horse goddess depicted in the Mabinogion. She is similar in many aspects to the Gaulish Epona, and later evolved into a goddess of sovereignty who protected the king form treachery.

She is Goddess of the Moon, Fertility, rebirth, wisdom, magick, transformation, beauty, artistic inspiration and the patroness of poets as well as the Divine Queen of the Fairies.