Answer:
Ivan III (1440-1505), called Ivan the Great, was grand duke of Moscow from 1462 to 1505. He completed the unification of Russian lands, and his reign marks the beginning of Muscovite Russia. ... The accomplishment for which Ivan is best known is the consolidation of Muscovite rule.
Answer: Expanding the Russian Empire, marrying a Greek princess, and going to war against the Tartars.