In the same ceremony, was also performed the marriage of her brother John George with Frederick II's daughter, Sophie.
As a dowry, Barbara received the amount of 20,000 Rhenish florins, who was provided by the citizens of Brzeg.
[2] Two years later (1547), Duke Frederick II died and George inherited the Duchy of Brzeg, who included the towns of Oława, Strzelin, Niemcza, Kluczbork, Byczyna, Wołów and Ścinawa.
In his will, he left the Duchy of Brzeg to his wife as her dower with the full sovereignty over this land until her own death.
The duchies of Oława and Wołów were received by her sons Joachim Frederick and John George as co-rulers, and because Barbara was the duchess in Brzeg, both brothers decided to settle his residence in Oława.