The death of his wife Barbara, who had been devoted to him, and who carefully abstained from political intrigue, broke his heart. Between the date of her death in August 1758 and his own in August 1759, he fell into a state of prostration in which he would not even dress, but wandered unshaven, unwashed and in a nightgown around his park. He was buried at the Convent of the Salesas Reales, Spain.