duke of Bourbon (from 1356), count of Clermont and of Forez. He was an ally of Bertrand du Guesclin, the Breton-French hero, and a staunch supporter of John II of France; when John was taken prisoner by the English at Poitiers, Bourbon became one of the hostages delivered to the English as a guarantee of the payment of the ransom. He returned to France in 1367 and again fought the English in Poitou and Guyenne (1368–70).