The Celtic horse symbol was associated with victory in war. The Celtic horse-goddess Epona (from epos, the Gaulish word for ‘horse’), or the ‘Great Mare’, was worshipped by the Gauls and was so popular that the Romans adopted her cult and built a temple to her.
The horse goddess Epona was believed to accompany the soul of the dying on its final journey.
Related to Epona is a female character of Welsh mythology named Rhiannon, who is widely believed to be a goddess, and is known also for the three birds that accompany her.
Celtic Horse Jewelry from Toulhoat and Amazon