In April 1314 he married Jeanne of Joigny, who succeeded her father John II as Countess of Joigny in 1335, but died on 2 September 1336. They had no children. He showed a marked, if foolhardy courage from the time of his first taking up arms (1324, in Aquitaine), and took part in the Battle of Cassel (1328). In December 1336, he married Maria de La Cerda y Lara (1310 – 19 November 1379, Paris), the daughter of Fernando de la Cerda, Lord of Lara. They had five children: He entered the War of the Breton Succession in 1340, and was subsequently killed at the Battle of Crécy.