Земский собор
The development of the Tsar's autocratic powers reached a peak during the reign of Ivan IV (1547–1584), known as "Ivan the Terrible". He strengthened the position of the monarch to an unprecedented degree, as he ruthlessly subordinated the nobles to his will, exiling or executing many on the slightest provocation. Nevertheless, Ivan is often seen as a farsighted statesman who reformed Russia as he promulgated a new code of laws (Sudebnik of 1550), established the first Russian feudal representative body (Zemsky Sobor), curbed the influence of the clergy, and introduced local self-management in rural regions. Tsar also created the first regular army in Russia - Streltsy.