When he was bested in the combat, he abandoned the struggle and retired to his estates, remaining neutral and independent. He then resided in Orthez, the capital of Béarn. In 1348 Gaston married Agnes, daughter of Philip, Count of Evreux (d. 1343), by his wife Jeanne II, queen of Navarre. By Agnes, whom he divorced in 1373, he had an only son, Gaston, who is said to have been incited by his uncle, Charles II of Navarre, to poison his father, and who met his death in 1381. It is probable that he was killed by his father; this is the account presented by Froissart.