Celtic mythology

Celtic mythology is the mythology of Celtic polytheism, apparently the religion of the Iron Age Celts. Like other Iron Age Europeans, the early Celts maintained a polytheistic mythology and religious structure. Among Celtic peoples in close contact with Rome, such as the Gauls and Celtiberians, their mythology did not survive the Roman empire, their subsequent conversion to Christianity, and the loss of their Celtic languages. Ironically, it is through contemporary Roman and Christian sources that what we do know of their beliefs has come down to us. However, those Celtic peoples who maintained either their political or linguistic identities (such as the Gaels and Brythonic tribes of the British Isles) did transmit at least vestigial remnants of the mythologies of their Iron Age forebears, which were often recorded in written form during the Middle Ages.