King Casimir III of Poland initiates campaigns …

Years: 1252 - 1395
King Casimir III of Poland initiates campaigns to take Galicia-Volhynia upon the death of Bolesław Jerzy II of Mazovia in the mid-fourteenth century; these occur from 1340 to 1366.

The heartland of Rus', including Kiev, meanwhile becomes the territory of the Grand Duchy of Lithuania, ruled by Gediminas and his successors, after the semi-legendary Battle on the Irpein River.

Following the 1386 Union of Krewo, a dynastic union between Poland and Lithuania, much of what will become northern Ukraine is ruled by the increasingly Slavicised local Lithuanian nobles as part of the Grand Duchy of Lithuania.

The so-called Galicia–Volhynia Wars end by 1392.

Polish colonizers of depopulated lands in northern and central Ukraine soon found or re-found many towns.

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