Guethenoc de Chateau-en-Porhoet
Guethenoc was born before 1008.  He died after 1021.

 UNKNOWN Allarum
UNKNOWN was born before 1010.

 Joscelin de Bretagne of Porhoet
Joscelin de Bretagne of was born before 1021 in Porhoet, Brittany, France.  He died in 1074.