section_path: History/Imperial Russia
section_name: Imperial Russia
paragraph_text: Imperial Russia
  
  Under Peter the Great, Russia was proclaimed an empire in 1721, and established itself as one of the European great powers. Ruling from 1682 to 1725, Peter defeated Sweden in the Great Northern War (1700–1721), securing Russia's access to the sea and sea trade. In 1703, on the Baltic Sea, Peter founded Saint Petersburg as Russia's new capital. Throughout his rule, sweeping reforms were made, which brought significant Western European cultural influences to Russia. He was succeeded by Catherine I (1725–1727), followed by Peter II (1727–1730), and Anna. The reign of Peter I's daughter Elizabeth in 1741–1762 saw Russia's participation in the Seven Years' War (1756–1763). During the conflict, Russian troops overran East Prussia, reaching Berlin. However, upon Elizabeth's death, all these conquests were returned to the Kingdom of Prussia by pro-Prussian Peter III of Russia.
  
  Catherine II ("the Great"), who ruled in 1762–1796, presided over the Russian Age of Enlightenment. She extended Russian political control over the Polish–Lithuanian Commonwealth and annexed most of its territories into Russia, making it the most populous country in Europe. In the south, after the successful Russo-Turkish Wars against the Ottoman Empire, Catherine advanced Russia's boundary to the Black Sea, by dissolving the Crimean Khanate, and annexing Crimea. As a result of victories over Qajar Iran through the Russo-Persian Wars, by the first half of the 19th century, Russia also conquered the Caucasus. Catherine's successor, her son Paul, was unstable and focused predominantly on domestic issues. Following his short reign, Catherine's strategy was continued with Alexander I 's (1801–1825) wresting of Finland from the weakened Sweden in 1809, and of Bessarabia from the Ottomans in 1812. In North America, the Russians became the first Europeans to reach and colonise Alaska. In 1803–1806, the first Russian circumnavigation was made. In 1820, a Russian expedition discovered the continent of Antarctica.