Historians often cite the 1240 Mongol sack of Kyiv as the final end of the Kyivan Rus’ federation, but as with most things there's more to the collapse of the Rus’ than one solitary event. For nearly two centuries prior to 1240, the balance of power in the Rus’ federation had been shifting gradually away … Continue reading Today in European history: the Mongols sack Kyiv (1240)