Dmitriy Yurievich Shemyaka was the second son of Yury of Zvenigorod by Anastasia of Smolensk and grandson of Dmitri Donskoi. Although his hereditary patrimony was the rich Northern town Galich-Mersky, Shemyaka is sometimes counted among the Grand Dukes of Moscow, which he held from 1446 to 1447. The causes of the Great Feudal War that rocked Muscovy in the second quarter of the 15th century, are still disputed. Wikipedia
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