“ CLISSON, OLIVIER DE (1336–1407) , French soldier, was the son of the Olivier de Clisson who was put to death in 1343 on the suspicion of having wished to give up Nantes to the English. He was brought up in England, where his mother, Jeanne de Belleville, had married her second husband. On his return to Brittany he took arms on the side of de Montfort, distinguishing himself at the battle of Auray (1364) , but in consequence of differences with Duke John IV. went over to the side of Blois. ”