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In Geoffrey's version, after the Battle of Camlann, Constantine is appointed Arthur's successor. However, Mordred's two sons and their Saxon allies rise against him.  He defeats them, and one of them flees to sanctuary in the Church of Amphibalus in Winchester while the other hides in a London friary.  Constantine tracks them down, and kills them before the altars in their respective hiding places.  This act invokes the vengeance of God, and three years later Constantine is killed by his nephew Aurelius Conanus .  Geoffrey's account of the episode may be based on Constantine's murder of two "royal youths" as mentioned by the 6th-century writer Gildas .