Mataram Sultanate
…territory spanned most of mainland Java and Madura, with vassals in Palembang, Sukadana, and Jambi. Mataram reached its peak of power during the reign of Sultan Agung Anyokrokusumo (r. 1613–1645) after the conquest of his most powerful rival, the prosperous state of Surabaya. Sultan Agung's death set off a period of gradual decline…