Who married Maud de Brienne?

Alfonso de la Cerda, (Valladolid 1270 - Ávila 1333), called "the Disinherited", was the elder son of Ferdinand de la Cerda and his wife Blanche of France, and was a grandson of Alfonso X of Castile. Alfonso and his brother Fernando were candidates for the Castilian-Leonese crown during the reigns of Sancho IV of Castile, Ferdinand IV of Castile and Alfonso XI of Castile. In 1331, Alfonso renounced his rights and swore allegiance to Alfonso XI of Castile.