(The treaty providing for his release in 1813 took the estate's name.)
The Château de Valençay was constructed for the d'Étampes de Valençay family.
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.
The double title (a prince and a duc) 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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To prevent the breakup of the estates, Edmond ceded the Dino property to his second son Alexandre (husband of Valentine de Sainte-Aldegonde), while his elder son Louis was styled Duke of Valençay and later inherited the Duchy of Sagan.