the Terrible, beat the Mongols, Tartars, and the Poles, forced nobles into service, first ruler to take the title tsar
set up secret police, the most powerful of the early czars. Learned, religious, and cruel. Saw treason everywhere and arrested, exiled, or excecuted many advisors, reduced boyars power, increased Russia's trade with western Europe and worked to expand borders, conquered Mongul lands to the east and south of Moscow. also known as ivan the terrible.