A mythical king of Britain, the son of Coillus, and grandson of Marius. According to Geoffrey of Monmouth he was the first Christian British king. He wrote to Eleutherus, the Bishop of Rome, requesting to be instructed by him in the Christian religion. Lucius began his reign in 180 or, according to others, in 125.
- Giles, J.A., ed. (1842). The British History of Geoffrey of Monmouth. London: James Bohn, p. 81.