In the ninth century, the area suffered of constant raids by Vikings. They were driven away by Alan Wry-beard in 938. Mouzeil then passed into the control of Wry-beard's duchy, becoming part of the Marches of Brittany. Under the feudal system it was in the barony of Ancenis and the county of Nantes. The area around Mouzeil suffered damages due to attacks by Henry Plantagenet in 1175 and King John of England in 1214, and the war of Breton succession from 1341 to 1365. In 1488, Charles VIII of France and his armies besieged Ancenis and pillaged Mouzeil and the surrounding areas.