Ivan IV Vasilyevich (; – ), commonly known as
Ivan the Terrible (,
Ivan Grozny), was the
Grand Prince of Moscow from 1533 to 1547 and
Tsar of All the Russias from 1547 until his death in 1584. His long reign saw the conquest of the
Khanates of Kazan,
Astrakhan and
Siberia, transforming Russia into a
multiethnic and multicontinental state spanning almost one billion acres, approximately . Ivan managed countless changes in the progression from a medieval
state to an
empire and emerging
regional power, and became the first ruler to be crowned as Tsar of All the Russias.