In the Mabinogion of Welsh mythology Rhiannon is the horse goddess reminiscent of Epona from Gaulish religion. Rhiannon was a daughter of Hefeydd the Old. She was married to Pwyll, and later, Manawydan.
Pwyll first met Rhiannon when she appeared as a beautiful woman dressed in gold and riding a white horse. Pwyll sent his horsemen after her, but she was too fast. After three days, he finally chased her himself. When he spoke, asking her to stop, Rhiannon told him she would rather marry him than the man she was being forced upon, Gwawl. She made a tryst with Pwyll and after a year from that day, he won her from Gwawl by tricking him to climb into a magic bag that Rhiannon had given to Pwyll, striking an agreement to free him in exchange for Rhiannon.