Bayezid II ascended the Ottoman throne in 1481. Like his father, Bayezid II was a patron of western and eastern culture. Unlike many other sultans, he worked hard to ensure a smooth running of domestic politics, which earned him the epithet of "the Just". Throughout his reign, Bayezid II engaged in numerous campaigns to conquer the Venetian possessions in Morea, accurately defining this region as the key to future Ottoman naval power in the Eastern Mediterranean. The last of these wars ended in 1501 with Bayezid II in control of the whole Peloponnese. Rebellions in the east, such as that of the Qizilbash, plagued much of Bayezid II's reign and were often backed by the shah of Persia, Ismail I, who was eager to promote Shi'ism to undermine the authority of the Ottoman state. Ottoman authority in Anatolia was indeed seriously threatened during this period and at one point Bayezid II's vizier, Hadım Ali Pasha, was killed in battle against the Şahkulu rebellion.