The term "Russian Tsars" refers to the emperors of Russia who ruled from the 16th century until the early 20th century. The first official Tsar was Ivan IV, also known as Ivan the Terrible, who was crowned in 1547. Tsars held absolute power and were seen as God's representatives on Earth, leading to a centralized and autocratic form of government. The last Tsar was Nicholas II, who reigned from 1894 until his abdication in 1917 during the Russian Revolution. The fall of the Tsarist regime marked the end of centuries of imperial rule in Russia, leading to the establishment of a communist government under Vladimir Lenin.