Tsardom of Russia
Early reign of Ivan IV

The development of the Tsar's autocratic powers reached a peak during the reign of Ivan IV, and he gained the sobriquet "Grozny". The English word terrible is usually used to translate the Russian word grozny in Ivan's nickname, but this is a somewhat archaic translation. The Russian word grozny reflects the older English usage of terrible as in "inspiring fear or terror; dangerous; powerful; formidable". It does not convey the more modern connotations of English terrible, such as "defective" or "evil". Vladimir Dal defined grozny specifically in archaic usage and as an epithet for tsars: "Courageous, magnificent, magisterial and keeping enemies in fear, but people in obedience". Other translations have also been suggested by modern scholars.

Ivan IV became Grand Prince of Moscow in 1533 at the age of three. The Shuysky and Belsky factions of the boyars competed for control of the regency until Ivan assumed the throne in 1547. Reflecting Moscow's new imperial claims, Ivan's coronation as Tsar was a ritual modeled after those of the Byzantine emperors. With the continuing assistance of a group of boyars, Ivan began his reign with a series of useful reforms. In the 1550s, he declared a new law code, revamped the military, and reorganized local government. These reforms undoubtedly were intended to strengthen the state in the face of continuous warfare. The key documents prepared by the so-called Select Council of advisors and promulgated during this period are as follows:
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