Guillaume de Narbonne
Guillaume de Narbonne was a younger son of Amalric II and Jeanne de l'Isle-Jourdain. Through his marriage to Gaillarde de Lévis, heiress of Montaigut, he held the lordships of Montaigut and Montagnac near Béziers.
A writ of 1337 names him alongside his brother Peter in a suit over the barony of Sévérac. He later lost his reason and died insane, leaving a son, Jean de Narbonne.