The Livonian campaign of Stephen Báthory (referred to as the Russo-Polish War among Polish historians) took place in the final stage of the Livonian War, between 1577 and 1582. Polish-Lithuanian forces led by Stephen Báthory (Batory), King of Poland and Grand Duke of Lithuania, successfully fought against the army of Ivan IV "the Terrible", Tsar of Russia, over the Duchy of Livonia and Polotsk. Russian forces were expelled from Livonia before the campaign was concluded by the Truce of Jam Zapolski.