http://www.earlybritishkingdoms.com/articles/bretart.html
The supposed Kingdoms of Cornouaille, Broërec, Domnonée et Léon.
c.550: The region is divided between five brothers. One, Canao, kills three of the others. The fifth, Macliau, is saved by St. Felix and the King, Conomor of Domnonée (alias Cunomorus) who appoints him as Bishop of Vannes.
560: Conomor is killed in a war against the Frankish armies of King Clotaire, youngest son of Clovis.
Gregory tells us that after the death of Canao, his brother, Macliau, gives up the Bishopric of Vannes to become King. We can be sure that in 568, Macliau was still Bishop for he participated in the consecration of a new church in Nantes two years after the Meeting of the Council of Tours (566) (Fortunat, poems, ch. 6, book III).
http://www.earlybritishkingdoms.com/kingdoms/496.html
This same site gives the "apparent" death of Hoel II Fychan of Brittany as 547.