Stephen Batory (Polish: Stefan Batory; Hungarian: Báthory István, 27 September 1533 - 12 December 1586) - Duke of Transylvania (1571-1576), King of Poland (1575-1586). ), The Grand Duke of Lithuania (1576–1586). Reigned together with Ona Jogailaitė. Reformed the army of the Republic of the Two Nations, concluded a peace treaty with Turkey and the Crimean khanate. By involving the Polish army in the Livonian War, he recaptured the Russian-occupied territories of the GDL and Livonia and forced the Russians to conclude a peace treaty. He played an important role in the transformation of Vilnius Jesuit College into Vilnius University.