Лжедмитрий I
In order to continue their efforts, the magnates took advantage of the earlier death of Tsarevich Dmitry (1591) under mysterious circumstances and of the appearance of False Dmitriy I, a pretender-impostor claiming to be the tsarevich. False Dmitriy was able to secure the cooperation and help of the Wiśniowiecki family and of Jerzy Mniszech, Voivode of Sandomierz, whom he promised vast Russian estates and a marriage with the voivode's daughter Marina. Dmitriy became a Catholic and leading an army of adventurers raised in the Commonwealth, with the tacit support of Sigismund III entered in 1604 the Russian state. After the death of Boris Godunov and the murder of his son Feodor, False Dmitriy I became the Tsar of Russia, and remained in that capacity until killed during a popular turmoil in 1606, which also eliminated the Polish presence in Moscow.