Prosper Louis, Duke of Arenberg
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In 1801, Louis Engelbert, Duke of Arenberg, Prosper's father, lost the former Duchy of Arenberg on the left bank of the Rhine but received a larger duchy on the right bank in 1803.
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His wife was given the present Hôtel de Chimay, known as the Hôtel de La Pagerie in Paris in 1808.