Ivan IV Vasilyevich (25 August 1530 – 28 March 1584), known in English as Ivan the Terrible, was Grand Prince of Moscow from 1533. His long reign saw the conquest of the Khanates of Kazan, Astrakhan, and Siberia, transforming Russia into a multiethnic and multiconfessional state spanning almost one billion acres, growing during his term at a rate of approximately 130 square kilometers a day. Ivan oversaw numerous changes in the transition from a medieval nation state to an empire and emerging regional power, and became the first Tsar of a new and more powerful nation.