Gustav Ernst von Stackelberg
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Graf Gustav Ernst von Stackelberg was a Russian diplomat of Baltic-German descent. He was the son of Otto Magnus von Stackelberg. By birth, he was member of the House of Stackelberg.
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Duchy of Warsaw
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The Duchy of Warsaw was a French client state established by Napoleon Bonaparte in 1807, during the Napoleonic Wars. It initially comprised the ethnically Polish lands ceded to France by Prussia under
Józef Poniatowski, the commander-in-chief of the Duchy of Warsaw's army
Polish uhlans from the Army of the Duchy of Warsaw, 1807–1815, painting by January Suchodolski