The double title, both Prussian and French, served to render the duc de Sagan a neutral party in World War II: his Château de Valençay provided a safe haven for treasures of the Louvre during the German occupation of France.
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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).
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Against their resistance, it became part of the Silesian Duchy of Żagań under the Piast duke Jan I, after his father-in-law Elector Rudolf III of Saxony had devastated the settlement.
It was devastated by the troops of Duke Jan II the Mad of Żagań on his 1477 expedition against the Brandenburg elector Albert Achilles of Hohenzollern and again by Imperial as well as Swedish forces during the Thirty Years' War.