Principality of Polotsk
In the early 12th century, the Principality of Polotsk disintegrated into smaller fiefs. The Principality of Minsk was established by one of the Polotsk dynasty princes. In 1129, the Principality of Minsk was annexed by Kiev, the dominant principality of Kievan Rus; however in 1146 the Polotsk dynasty regained control of the principality. By 1150, Minsk rivaled Polotsk as the major city in the former Principality of Polotsk. The princes of Minsk and Polotsk were engaged in years of struggle trying to unite all lands previously under the rule of Polotsk.