Czar Nicholas I, also known as Tsar Nicholas I, was the Emperor of Russia from 1825 until his death in 1855. He was known for his authoritarian rule and conservative policies. As the monarch of Russia, Nicholas I was also referred to as the Autocrat of All the Russias. Moreover, he was considered one of the most influential czars in Russian history, and his reign was marked by numerous wars and expansionist policies. Some of the other synonyms used to refer to Czar Nicholas I include Emperor Nicholas I, Tsar Nikolai I, and Nicholas Pavlovich.