sentences:  Polish king Władysław IV Vasa, whose father and predecessor was Sigismund III Vasa, had been elected by Russian boyars as tsar of Russia during the Time of Troubles, renounced all claims to the title as a condition of the peace treaty.The autocracy survived the Time of Troubles and the rule of weak or corrupt tsars because of the strength of the government's central bureaucracy.Government functionaries continued to serve, regardless of the ruler's legitimacy or the boyar faction controlling the throne.