Rivallo IV, Prince of Brittany, Earl of Poher, (died Nov 12, 857), was a son of

Saint Salomon Salomon ( br, Salaün) (died 874) was Count of Rennes and Nantes from 852 and Duke of Brittany from 857 until his death by assassination. He used the title King of Brittany intermittently after 868. In 867, he was granted the counties of Avranches ...

, or Salaün, King of Brittany. He had a son called

Alan, Earl of Vannes Alan I (french: Alain; died 907), called the Great,F. McNair (2015), "Vikings and Bretons? The Language of Factional Politics in Late Carolingian Brittany", ''Viking and Medieval Scandinavia'' 11: 183–202. was the Count of Vannes and Duke of Bri ...

, Prince of Brittany, who died around 907.

References

857 deaths Earls of Poher Princes of Brittany 9th-century Breton people {{France-noble-stub