Second-in-command (1776), colonel (1784) of the regiment of Barrois. Charged with receiving refugees from Holland (1787). Minister to the Hague (1788). Opposed French Revolution; emigrated to Varennes. Ambassador to Turin (1814), England (1815-19). Peer of France (1815).
Born at Saint-Domingue. Probably applied to Franklin on behalf of his brother Marie- Joseph-Eustache d’Osmond, who served with the French at the siege of Yorktown.