Kammala jumla mai zuwa: Bayan raba Rus a cikin 1097, Iskorosten ya kasance a ƙarƙashin ikon sarakunan Kyivan. A watan Disamba na 1240 mamayewar Mongol na Rus ', wanda Batu Khan ya jagoranta ya kori kuma ya ƙone birane da ƙauyuka da yawa a yankin Iskorosten. Daga 1243 Mongol-Tatars, a cikin nau'i na Golden Horde (yanki na yammacin daular Mongol) ya yi mulki. Bayan nasara a kan Tatars a
Yaƙin Blue Waters a cikin 1362 (ko 1363) Babban Duke na Lithuania Algirdas ya haɗa waɗannan ƙasashe zuwa Grand Duchy na Lithuania. Daga baya ya gabatar da su ga ɗaya daga cikin jarumansa Terekha daga Bryansk don aminci. Daga 1385, bayan kafa Union of Krewo, wannan yankin ya kasance ƙarƙashin tasirin Poland.