Queen dowager
Wenceslaus died in 1419. As a queen dowager, Sophia sought refuge with her brother-in-law, Sigismund of Hungary, whose claims on the throne of Bohemia she supported. For a period of time, Sophia was the official regent of Bohemia. In October 1419, the leading Bohemians signed a treaty with queen dowager Sophia with a promise to protect law and order. She soon lost authority, however. Sophia and Sigismund were involved in managing a property in Prešpurk together. There were rumours that Sophia and Sigismund had an affair. Sigismund remarked that the Queen dowager of Bohemia would surely marry again – possibly to Wladyslaw II of Poland.