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Berthold appears in older volumes of Royal genealogy (see Sources list for examples), as King of the Saxons from 586 to his death in 633. He is shown as the son of Bodicus, Prince of the Saxons from 540-586, and the father of Sighard, King of the Saxons from 633-691.
However none of these books cite any sources and no earlier works, contemporary to the period in which he is supposed to have lived, confirm his existence. He must be considered as totally legendary.