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Tsar - Wikipedia
Tsar | Russian Empire, Autocracy, Monarchy | Britannica
Tsar - World History Encyclopedia
Nicholas II | Biography, Wife, Abdication, Death, & Facts
Emperor of Russia - Wikipedia
Tsardom of Russia - Wikipedia
Russia - Expansion, Tsars, Revolution | Britannica
From Tsar to U.S.S.R.: Russia's Chaotic Year of Revolution
Tsar Timeline - World History Encyclopedia
Peter the Great - World History Encyclopedia