King Constans of Britain appears in Geoffrey of Monmouth’s Historia Regum Britanniae and later derived works as the son of King Constantine. He was originally a monk, from which he is instead called King Moines (Monk) in the Story of Merlin and derived versions. Bauduins Butors calls him Ivoine. Vortigern who had brought him from the monastery to be made king later deceived some Picts into murdering Constans.