Ivan IV Ivan the terrible (1530-1584)
Ivan's "bad period" began in 1570 after his wife died. He accused the boyars of poisoning his wife. Ivan turned against the boyars and created a secret police. He began executing many boyars and seized their estates.
- He killed his oldest son (heir) in a violent quarrel
- Said to have died in 1584 while playing chess
Legacy: He expanded Russia, introduced new laws which restricted movement of peasants and solidified his rules, and ordered St. Basil's Cathedral to be built.