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Sergey Fyodorovich Platonov (born June 28 [June 16, Old Style], 1860, Chernigov, Russia—died Jan. 10, 1933, Samara, Russia, U.S.S.R.) was a leading Russian historian of the early 20th century. Having graduated from the University of St. Petersburg in 1882, Platonov held various academic posts at that institution and elsewhere. After 1920 he was a member of the U.S.S.R.’s Academy of Sciences. Most of Platonov’s scholarly work dealt with the Time of Troubles, the chaotic interregnum...