(1019 – 1054)
Development of the specific system.
Yaroslav I the Wise, having become the Grand Prince of Kiev, decided to take possession of the volosts of the deceased brothers, but met a dangerous rival in the person of Mstislav Tmutarakansky, known as Udalogo. He entered into a fight with him, and only after 5 years he managed to make peace with Mstislav.
They divided the Russian land into two halves, along the Dnieper. Yaroslav received western territory, Mstislav – eastern.
Only after the death of Mstislav he managed to unite under his authority all the land of Russia except the Polotsk principality.