Muscovite–Volga Bulgars war (1376)
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The Grand Duchy of Moscow-Volga Bulgars War of 1376 was organized by princes Dmitry Donskoy of Muscovy, and Dmitry Konstantinovich of Nizhny Novgorod-Suzdal. The combined Muscovite–Suzdalian army was led by Moscow Governor Dmitry Mikhailovich Bobrok Volynskyy, and Dmitry of Suzdal's sons Vasily and Ivan Dmitriyevich [ru]. Volga Bulgaria, which was at the time an ulus [ru] of the Golden Horde (who had converted to Islam in 1313[1]), was ruled by emir Hassan Khan (in Rus' chronicles Assan) and Horde protégé Muhammad Sultan (Sultan Mahmat).[2]