Domnonée is the modern French form of Domnonia or Dumnonia (Latin for "Devon"; Breton: Domnonea), a historic kingdom in northern Armorica (Brittany) founded by British immigrants from Dumnonia (Sub-Roman Devon) fleeing the Saxon invasions of Britain in the early Middle Ages.
to have been founded in the 4th century by Christian Briton immigrants; it greatly expanded in the wake of subsequent waves of refugees from the Saxon invasions of Britain.
Domnonée retained close political links between the Celtic territories in Great Britain (Wales, Cornwall, Devon), and the newly created Brittany.
[1] A number of legends and lives of Breton saints contain references to the close political ties between religious communities in Wales and Brittany.
He would have been a British military leader who was guarding the English Channel from attacks by pirates, perhaps in alliance with Childebert I, son of Clovis I.