Profile of Russia's first Tsar, Ivan the Terrible, the 16th-century potentate with an insatiable appetite for torture. Raised in an unstable atmosphere of intrigue and assassination, he was notorious for his sadistic impulses, frying and boiling supposed enemies and masterminding orgies of cruelty in his 'monastery'. A psychopath with an uncontrollable temper, he occasionally interrupted the raping and slaughter with periods of repentance, not least when he lashed out and killed his own son