A County emerged in the region, and also a Bishopric with its seat at Quimper, the capital of Cournouaille.
Alan Barbetotte, who re-established a Duchy in Brittany in 936 after Viking depredations, came from Cornouaille. His line failed to establish itself, though Alan’s great-granddaughter married a Count of Cornouaille. Their son married the heiress of the Counts of Rennes, who had been Dukes of Brittany in the meantime, and he and his male descendants were Dukes of Brittany, 1066-1166. The later Dukes descended from their heiress, Constance, who died in 1201.
The Bishopric of Quimper still survives, with the Department of Finistère as its diocese.