A Czar (or Tsar) was the title used for the emperors of Russia from the 16th century until the early 20th century. The term is derived from the Latin word "Caesar," reflecting the ruler's authority and power. Czars ruled with absolute power, often controlling the government, military, and church, and they were seen as the supreme leaders of the Russian Empire. The most famous Czar was Peter the Great, who reigned from 1682 to 1725 and is known for modernizing Russia and expanding its territory. The last Czar, Nicholas II, was overthrown during the Russian Revolution in 1917, leading to the end of the imperial rule in Russia.