Coorinates: 20°42′N 70°59′E / 20.7, 70.98 Diu is a city in Diu district in the state of Daman and Diu, India. It is famous for being the location of the pivotal Battle of Diu in 1509 between Portugal and a combined force of Turkey, Egypt, Venice, Dubrovnik and the then Sultan of Gujarat, Mahmud Begada.