While the Khan of the Golden Horde initially attempted to limit Moscow's influence, when the growth of the Grand Duchy of Lithuania began to threaten all of Russia, the Khan strengthened Moscow to counterbalance Lithuania, allowing it to become one of the most powerful cities in Russia. In 1380, prince Dmitry Donskoy of Moscow led a united Russian army to an important victory over the Mongols in the Battle of Kulikovo. Afterward, Moscow took the leading role in liberating Russia from Mongol domination. In 1480, Ivan III had finally broken the Russians free from Tatar control, and Moscow became the capital of an empire that would eventually encompass all of Russia and Siberia, and parts of many other lands.