The Tsardom of Russia or Tsardom of Rus' (Russian: Русское царство, romanized: Russkoye tsarstvo, later changed to: Российское царство, Rossiyskoye tsarstvo), also externally referenced as the Tsardom of Muscovy, was the centralized Russian state from the assumption of the title of Tsar by Ivan IV in 1547 until the foundation of the Russian Empire by Peter I in 1721.

The name Russia for the Grand Duchy of Moscow began to appear in the late 15th century, and become official in 1547 when Tsardom of Russia was established. Before this point, the states encompassing modern Russian territories were Kievan Rus' and the Grand Duchy of Moscow.Another important starting point was the official end in 1480 of the overlordship of …