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Wiki information Rivallo:

Rivallo
Person

Rivallo 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 with moderation. Geoffrey describes him as a "peaceful and fortunate youth, who ruled the...

Rivallo IV of Brittany
Person

Rivallo IV, Prince of Brittany, Earl of Poher, was a son of Saint Salomon, or Sala√ľn, King of Brittany. He had a son called Alan, Earl of Vannes, Prince of Brittany, who died around 907.