Two entries with the name Mathan.

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Mathan

Mathamas, Mathans

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One of the many Saxon kings to invade northern Britain at the beginning of Arthur’s reign.

Under King Hargadabran he fought Arthur at Clarence. Arthur’s Sir Dodinel killed him.

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Source
Le Livre d’Artus | Early 13th century

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Mathan

Marthan, Marthaut, Matan, Mathamas

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A knight who fought before Clarence on the rebel kings’ side.

He is probably identical with the Saxon king Mathan in the entry above.

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