Ku qor sii wadida cutubkan - Ka dib qeybinta Rus ee 1097, Iskorosten waxay ku sii jirtay xukunka amiirrada Kyivan. Bishii Diseembar 1240 weerarkii Mongol ee Rus', oo uu hoggaaminayay Batu Khan ayaa la dhacay oo gubay magaalooyin badan iyo degsiimooyin ku yaal gobolka Iskorosten. Laga soo bilaabo 1243 Mongol-Tatars, oo ah qaabkii Golden Horde (qaybta galbeed ee boqortooyadii Mongol) ayaa xukumay. Ka dib guushii ay ka gaareen Tatars-kii dagaalkii Blue Waters
1362 (ama 1363) Grand Duke of Lithuania Algirdas wuxuu ku daray dhulalkan Grand Duchy of Lithuania. Ka dib wuxuu siiyey mid ka mid ah fardooleydiisa Terekha oo reer Bryansk ah si uu ugu adeego si daacad ah. Laga soo bilaabo 1385, ka dib markii la aasaasay Midowgii Krewo, dhulkani wuxuu ku hoos jiray saameynta Poland.