A prince of Wales who joined Arthur’s battle against the Saxons at Vambieres. He is found exclusively in the Livre d’Artus. His cousin, Guinganbresil, was an enemy of Gawain. When Illesgaleron did not show sufficient hatred for Gawain, Guinganbresil turned on him. There is a twelfth-century non-Arthurian French romance called Illes et Galeron.