 Complete the following phrase:  For centuries, the region was only sparsely populated by various nomadic groups such as Scythians, Alans, Huns, Bulgars, Pechenegs, Kipchaks, Turco-Mongols, Tatars and Nogais. After the Mongol invasion of Kievan Rus, the territory was ruled by the Golden Horde until the Battle of Blue Waters 1362, which allowed Algirdas to claim it for the Grand Duchy of Lithuania. As a result of the 