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Rivallo (Welsh: Rhiwallon) was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He was the son of King Cunedagius and was noted as a young king who reigned frugally[citation needed].
His reign was troubled by disasters: a rain of blood that lasted three days, a devastating plague, and a great swarm of flies. He was succeeded by his son, Gurgustius.
| Preceded by Cunedagius |
Mythical British Kings | Succeeded by Gurgustius |
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