The division of land between the brothers progressed in a stable position, this was easily facilitated by the vast distances of the region, where Mstislav expanded south while Yaroslav ventured north.

[4] He began establishing Chernigov as one of the most important administrative centres in the region, whereupon he constructed defensive barriers and expanded the citadel.

Fortified ramparts were built with a circumference of 2.5 km with an average height of 4 meters, vast even by the standards of the Rus.

With the death of his brother, Yaroslav the Wise attained sole authority of the dynasty and claimed the principality of Chernigov, he would rule until 1054.

[4] Subsequently, his son who would eventually be titled Grand Prince Sviatoslav initiated the Chernigov branch of the Rurikids.