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Charles-François de Broglie, marquis de Ruffec (20 August 1719–16 August 1781), second son of François-Marie, 1st duc de Broglie, was a French soldier and diplomat.
He served for some years in the army, and afterwards became one of the foremost diplomats in the service of Louis XV. He is chiefly remembered in connection with the secret du Roi, the private—as distinct from the official—diplomatic service of Louis XV, of which he was the ablest and most important member.
de:Charles-François de Broglie