Antoine de Vignerot du Plessis
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Louis Antoine Sophie de Vignerot du Plessis, 4th Duke of Richelieu (4 February 1736 – 1791), was a French nobleman and general. He was known by the courtesy title of Duke of Fronsac before 1788. He also held the titles of Prince de Mortagne, Marquis du Pont-Courlay, Count of Cosnac, Baron de Barbezieux, Baron de Coze and Baron of Saugeon.