Öz The peninsula of the Peloponnese (in southern Greece), which is also known as the Morea, was first partly conquered in 1397 CE by die Ottoman Sultan Beyazit I from the Byzantines, and was completely overrun in 1460 by Sultan Mehmet II, who was received as a deliverer by the Greek Orthodox Christian population, then suffering under the rule of the Roman Catholics. In 1698 the Ottomans were complled to cede the Peloponnese to the Venetians, under die Treaty of Carlowitz, but in 1718 it was retroceded to the Ottoman Empire under the Treaty of Passarowitz.