In the 9th century the island was devastated by the Vikings and the priory was placed under the secular protection of the Counts of Cornouaille (in Armorican Brittany). In 1029 the Count of Cornouaille Alain Canhiart entrusted the island to the recently founded Sainte-Croix de Quimperlé Abbey. As it was directly under the authority of the Pope, Belle-Ile benefited from immunity from being under the authority of both the bishopric of Vannes and the duchy of Brittany. The administration of the island was delegated to a provost of the abbey who had temporal power (the right of low, middle, and high justice which was performed sometimes at Belle-Ile and sometimes at Quimperlé). From 1408 the right was exercised only at Quimperlé.