History of Russia (1721–96) mounting financial difficulties and Elizabeth's death in 1762. Her nephew and successor, Peter III (grandson of Peter I), took Russia out of the war. Peter III reigned for a mere six months before his wife, Catherine II, led a coup against him. He was born and raised in Germany in the court of his father, the Duke of Holstein-Gottorp, and did not come to live in Russia until he was fourteen. It is difficult to ascertain his character because there exist many contradictory accounts. Catherine's journals describe him as incompetent bordering on retarded, yet his acts as emperor illustrate a
Russia this conflict Russia annexed East Prussia for a while and even took Berlin. However, upon Elisabeth'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 1762–96, presided over the Age of Russian Enlightenment. She extended Russian political control over the Polish-Lithuanian Commonwealth and incorporated most of its territories into Russia during the Partitions of Poland, pushing the Russian frontier westward into Central Europe. In the south, after successful Russo-Turkish Wars against Ottoman Turkey, Catherine advanced Russia's boundary to the Black Sea, defeating the Crimean Khanate.