In the reign of Volodymyr the Great (980-1015) the Kyivan State almost finished its expansion. It occupied the territory from Peipus, Ladoga and Onega lakes in the north to the river Don, Ros, Sula, Southern Bug in the south, from the Dniester, the Carpathians, the Neman, Western Dvina River in the west to the Volga and the Oka River in the east, its area became about 800,000 km. Although some of his predecessors already accepted Christianity for themselves, Vladimir decided to convert the entire population of the state to the new religion. Partially with the help of Byzantine missionaries preachers, partly by the brutal violence, he finally made all Kyiv population to be baptized. For this action, the Ukrainian, and later the Russian Orthodox Churches canonized him under the name of Vladimir the Baptist.