After the partition of Rus in 1097, Iskorosten remained under the jurisdiction of the Kyivan princes. In December 1240 the Mongol invasion of Rus', led by Batu Khan sacked and burned many cities and settlements in the region of Iskorosten. From 1243 the Mongol-Tatars, in the form of the Golden Horde (the western section of the Mongol empire) ruled. After victories over the Tatars at the Battle of Blue Waters in 1362 (or 1363) the Grand Duke of Lithuania Algirdas annexed these lands to the Grand Duchy of Lithuania. Later he presented them to one of his knights Terekha from Bryansk for faithful service. From 1385, after the formation of the Union of Krewo, this territory came under the influence of Poland.