Gerennus ('' Welsh:'' ''Geraint map Elidyr'') was a legendary king of the

Britons British people or Britons, also known colloquially as Brits, are the citizens of the United Kingdom, the British Overseas Territories, and the Crown dependencies.: British nationality law governs modern British citizenship and nationality, w ...

as recounted by

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

. He came to power in 275BC. He was a son of King Elidurus and was succeeded by his son Catellus. According to Geoffrey, his descendants ruled Britain through the time of the

Roman invasion of Britain The Roman conquest of Britain was the Roman Empire's conquest of most of the island of Britain, which was inhabited by the Celtic Britons. It began in earnest in AD 43 under Emperor Claudius, and was largely completed in the southern half o ...

References

{{Geoffrey of Monmouth Legendary British kings 3rd-century BC legendary monarchs