https://books.google.com/books?id=aU4EUwqm7N8C&pg=PA76&dq=gradlon+6...

Count Erispoë I de Poher et Browerec

was born about 760 in Bretagne, France. He died in 812. He was married about 784.

• He had the following children:

1. M i ) Count Rivallon III de Poher
2. M ii ) Nominoe de Bretagne King of Brittany

Wikipedia: https://en.wikipedia.org/wiki/List_of_rulers_of_Brittany

Early Breton rulers

• Conan Meriadoc (4th century) - by tradition, the founder of Brittany
• Budic II (early 6th century)
• Waroch II (late 6th century)
• Saint Judicaël (early 7th century)
• Alain II Hir (c.640?-690)
• Morman (r. 814–818)
• Wihomarc (r. 822–825)

Dukes of Brittany under the Carolingians

• Nominoe (or Nevenoe) (r.841–851), as a missus dominicus of the Emperor Louis the Pious,[5] a count of Vannes (Gwened) and arguably a duke (dux) of Brittany
• Erispoe (r.851–857), as a duke, then as a king
• Salomon (or Salaun) (r.857–874), as a duke, then a king ...