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Dmitriy Yurievich Shemyaka (died 1453) was the second son of Yury of Zvenigorod by Anastasia of Smolensk and grandson of Dmitri Donskoi. His hereditary patrimony was the rich northern town Galich-Mersky. When his brother prince Vasily I of Moscow died in 1425, he and his 10-year-old nephew Vasily started fighting over the right to the throne, causing the Muscovite War of Succession (1425–1453). Wikipedia