Its capital was Żagań in Lower Silesia, the territory stretched to the town of Nowogród Bobrzański in the north and reached the Lusatian Neisse at Przewóz in the west, including two villages beyond the river (Pechern and Neudorf).
After 1329 Henry I only retained the Lusatian towns of Lubań, Żytawa, and Przewóz.
At Podrosche (Podroždź) is a road border crossing to the Polish village of Przewóz.
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In 1449 the Duchy was divided into two districts: Żagań and Przewóz.
Gmina Przewóz contains the villages and settlements of Bucze, Dąbrowa Łużycka, Dobrochów, Dobrzyń, Jamno, Lipna, Mała Lipna, Mielno, Piotrów, Potok, Przewóz, Sanice, Sobolice, Straszów and Włochów.
Ultimately, the division was made in 1412: Jan I retained Żagań, and one year later (in 1413) he also took possession over the Duchy of Przewóz, inn the Polish-German border area (obtained as a result of his marriage with Scholastika, a daughter of Elector Rudolph III).
The division of their domains was effective in 1449: Jan II and Wenceslaus received Przewóz as co-rulers.
In September 1939, during the Invasion of Poland, two large units of the Polish Army (13th Infantry Division and Wilenska Cavalry Brigade) evacuated eastwards on a wooden bridge at Przewoz.
Duke Jan II the Mad had his older brother Balthasar imprisoned and starved to death at the castle's tower in 1472, shortly before he sold his duchy to Duke Albert III of Saxony.