
Boyar tsar during the Time of Troubles.
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Ivan Bolotnikov led a massive peasant and Cossack uprising against Vasily IV, claiming to be a commander of the resurrected False Dmitry. The rebels besieged Moscow but were defeated by Vasily's army in 1607.
Vasily Shuisky was proclaimed Tsar by a boyar assembly after the overthrow of False Dmitry I. His coronation was irregular, lacking the traditional Zemsky Sobor approval, which weakened his legitimacy.
False Dmitry II, another impostor, established a rival court at Tushino near Moscow. Vasily IV's forces were unable to dislodge him, leading to a dual power situation in Russia for over a year.
Vasily IV signed a treaty with Sweden, ceding the fortress of Korela in exchange for Swedish military aid against False Dmitry II and the Polish intervention. This brought Sweden into the Russian conflict.
After the Polish army defeated Russian-Swedish forces at the Battle of Klushino, boyars overthrew Vasily IV. He was forcibly tonsured as a monk and later handed over to the Poles, dying in captivity in 1612.
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