To the West, the Drevlians' territories reached the Sluch River, where the Volynians (related to the territory of Volynia) and Buzhans (related to the name of Southern Bug river) lived.
He chose Moscow as his primary seat after he had lived for several years in Volodymyr-Volynskyi in Volynia.
Volyn was once part of Kievan Rus' before becoming an independent local principality and an integral part of the Halych-Volynia, one of Kievan Rus' successor states.