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Tsar - Wikipedia
List of Russian monarchs - Wikipedia
Tsar | Russian Empire, Autocracy, Monarchy | Britannica
Nicholas II - Wikipedia
Tsar - World History Encyclopedia
Nicholas II | Biography, Wife, Abdication, Death, & Facts
Tsar Timeline - World History Encyclopedia
The Rise & Fall of the Russian Tsars | Britannica
The COMPLETE list of Russian tsars, emperors and presidents
Romanov Family: Facts, Death & Rasputin | HISTORY