In 933, William I Longsword swore to Raoul as King of Western Francia. In turn Raoul gave him lordship over much of the lands of the Bretons including Avranches and the Cotentin. But the Bretons fought to keep these lands. They were led by Alan II, Duke of Brittany and Count Berenger of Rennes. It ended shortly with Alan fleeing to England and Beranger seeking to be on friendly terms with the Normans. In 935, William arranged a marriage between his sister Adela and William, count of Poitou with the approval of Hugh the Great. At the same time William married Luitgarde, daughter of count Herbert II of Vermandois. Her dowry gave William the lands of Longueville, Coudres and Illiers l'Eveque. 