At her death in 1766 , it reverted to the Crown in the person of Charles III .
Philip 's successor Ferdinand VI bequeathed the royal site of San Ildefonso , with all it contained , to his father 's second wife , Isabel Farnese .
At wife 's death in 1766 , San Ildefonso reverted to the Crown in the person of Charles III .
Philip 's successor Ferdinand VI bequeathed the royal site of San Ildefonso , with all it contained , to his father 's second wife , Isabel Farnese .