Duke of Poix
Encyclopedia
The title of Duc de Poix was a French peerage created in 1663, which became extinct in 1687.

It is also one of the secondary titles of the current ducs de Mouchy
Duc de Mouchy
The title of duke of Mouchy was a French peerage held by members of a cadet branch of the Noailles family.The founder of the branch, Philippe, comte de Noailles , was the younger brother of Louis, 4th duc de Noailles and a marshal of France....

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