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Mordred is a legendary figure of Britain, known in the Matter of Britain as a notorious traitor who fought King Arthur at the Battle of Camlann, where he was killed, and Arthur fatally wounded.

Tradition differs on his relationship to Arthur, which variously reports that he was Mordred's uncle or father. In more detail there are three versions of his parentage:

The earliest mention of Mordred is in the Annales Cambriae, a chronicle that forms part of one of the recensions of the Historia Britonum. Mordred is mentioned again in Welsh tradition in the Welsh Triads: in one triad, based on Geoffrey of Monmouth's Historia Regum Britanniae, provides an account of his betrayal of Arthur; in another, he is described as the author of one of the "Three Unrestrained Ravagings of the Isle of Britain" -- he came to Arthur's court at Kelliwic in Cornwall, devoured all of the food and drink, and even dragged Gwenhwyfar (better known as Guinevere) from her throne and beat her.

Geoffrey of Monmouth introduced the figure of Mordred to the world beyond Wales. He tells of when Arthur set forth to wage war on Rome, he left Mordred behind to rule his kingdom and to protect Guinevere; during his absence Mordred made himself king and married Gwenevere, forcing Arthur to return to Britain, where he and Mordred fought at Camlann. The battle (dated to either 537 or 542) resulted in the deaths of both Arthur and Mordred along with most of their armies.

Mordred is mentioned as having two or three marriages:

Some accounts mention Mordred as being survived by Melehan and Melou, his twin sons though which one of his wives was their mother is usually left unmentioned. They reportedly tried to claim the throne of Britain for themselves following the death of Arthur and Mordred. Melehan was eventually slain by Lancelot and Melou by Bors.