Russian Empire
The Russian Empire, also known as Imperial Russia or simply Russia, was an empire that existed across Eurasia and North America from 1721, following the end of the Great Northern War, until the Republic was proclaimed by the Provisional Government that took power after the February Revolution of 1917.
Emperor of All Russia
On November 2, 1721 Peter I accepted the title. The Dutch Republic and Kingdom of Prussia immediately recognized the new title of the Russian Tsar, followed by the Kingdom of Sweden in 1723, the Ottoman Empire in 1739, the British Empire and the Austrian Empire in 1742, French Empire and the Spanish Empire in 1745, and finally the Polish-Lithuanian Commonwealth in 1764. Since then the Russian State was referred to as the Russian Empire.