The Truce or Treaty of Yam-Zapolsky (Ям-Запольский) or Jam Zapolski, signed on 15 January 1582 between the Polish-Lithuanian Commonwealth and the Tsardom of Russia, was one of the treaties that ended the Livonian War. It followed the successful Livonian campaign of Stephen Báthory, culminating in the Siege of Pskov. The truce was concluded with help of papal legatus Antonio Possevino and was signed for the Polish-Lithuanian Commonwealth by King of Poland and Grand Duke of Lithuania Stefan Batory and for Russia by Tsar Ivan the Terrible, and established a ten-year truce.