As soon as the 1559 Treaty of Cateau-Cambrésis ended hostilities between France and the Hapsburgs, Phillip II, who had taken the thrones of Spain and Naples on the abdication of his father, Charles V, in 1555, immediately organized a major naval expedition against the corsair base at the island of Jerba, off the coast of Tunisia. The Hapsburgs conquered the island, but in 1560 the Ottoman fleet under Piyale Pasha defeated the Hapsburg fleet there. In 1565, the Ottomans attempted to conquer Malta, which had become the base of the Knights of St. John after Sulayman drove them from Rhodes. The knights, under their grand master Jean Parisot de la Valette, won renown for the epic defense. The Ottomans withdrew before a relief force arrived.