In her husband's will, Anna received the Duchy of Oława as her Oprawa wdowia, with full sovereignty until her own death.
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Duke George II died on 7 May 1586 and his two sons inherited only Oława-Wołów as co-rulers, because he left Brzeg to his widow Barbara as her Oprawa wdowia.
A few months later, Duke Louis I give his grandson the half of the rents of the towns of Brzeg, Wierzbno and Oława.
Joachim Frederick of Brieg (1550–1602), Duke of Oława, Wołów, Brzeg, and Legnica
As a Teutonic Knight, Siemowit was successively named komturem of Oleśnica Mała near Oława since 1360, Prior of Poland, Bohemia, Moravia, Austria, Styria and Carinthia since 1372 and Governor and Treasurer of the Order in Germany since 1384.