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Gerennus 
Summary
Gerennus (Welsh: Geraint map Elidyr) was a legendary king of the Britons as recounted by Geoffrey of Monmouth. He came to power in 275BC.[1]
He was a son of King Elidurus and was succeeded by his son Catellus.[2] According to Geoffrey, his descendants ruled Britain through the time of the Roman invasion of Britain.
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