From Cokayne's "Complete Peerage", in the article on Richmond: During his mother's lifetime Alain seems to have ruled Brittany jointly with his brother, EUDES. On her death, dissention broke out. Peace was restored and a settlement made. EUDES received a territory corresponding roughly to the dioceses of Dol, St. Malo, St. Brieuc and Treguier, reduced in the hands of his successors to the last two named dioceses. Alain retained the rest of Brittany.
Per Galliou and Jones' "The Bretons", there were disputes along the frontier with Normandy - the Cousnon River - during the reign of the Norman Duke Robert I (RIN 1323), Alain's cousin.

Odo II (Eudes) of Blois, Count of Blois, b. CIR 990
Berthe of_Blois
Father: Eudes_II
Mother: Ermengarde of_Auvergne

Family 1: Alain_III

* Marriage: ABT 1027

1. Havoise of_Brittany