By the end of the Roman period, the settlement of "Ingena", capital of the Abrincatui tribe, had taken the name of the tribe itself. This was the origin of the name "Avranches". In 511 the town became the seat of a bishopric (suppressed in 1790) and subsequently of a major Romanesque cathedral dedicated to Saint Andrew which was dismantled during the French revolutionary period. As the region of Brittany emerged from the Roman region of Armorica, Avranchin was briefly held by Alan I, King of Brittany as part of the Kingdom of Brittany at the turn of the 10th century. The regions that later became the Duchies of Normandy and Brittany each experienced devastating Viking raids, with Brittany occupied by Vikings from 907 to 937. In 933 Avranches and its territory, the Avranchin, were ceded to the Normans.