Sisillius III () was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He reigned approximately 173–167BC.Monarchie Nobelesse website, Bretons
History He was preceded by OenusNational Library of Wales, Welsh Classical Dictionary page 584 and succeeded by Beldgabred. He shares his name with one of the sons of Ebraucus and his ancestors Sisillius II and Sisillius I.
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