Russia is a complicated place to document. The first four rulers of what was to become the Russian empire were Ryurik, Oleg, Igor, Olga (Igor's wife and Svyatoslav's mother was Regent for Svyatoslav I) and Svyatoslav I. The first ruler to use the title Tsar, was Ivan III (The Great). All previous rulers had used titles like "Grand Duke", "Prince" and "Grand Prince". Subsequent Russian rulers to use the title Tsar were Ivan IV (The Terrible), Fyodor I and Boris Godunov. After the end of the Ryurikid Dynasty and the establishment of the Romanov Dynasty, all Russian rulers were known as Tsar and/or Emperor or Tsarina and/or Empress.
Russia.
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a Leader
None, because czars were the kings in Russia.
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Czars
The first was Ivan IV (also known as Ivan the Terrible), and the last was Nicholas II.
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Princes and Czars did change the territory of Russia because they wanted more power and influence.
Czars were no longer in Russia
Prior to people like Lenin and Stalin as well as Putin coming to power Russia was ruled by a system of Czars. In total the country had 19 Czars.
Tzars (Czars, Tsars) were the monarchs of Russia before the Russian Revolution in 1917.