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Philippe-Emmanuel de Lorraine, duke de Mercoeur (born Sept. 9, 1558, Nomény, France—died Feb. 19, 1602, Nürnberg [Germany]) was a prince who led the resistance in Brittany against King Henry IV of France when that monarch was trying to consolidate his kingdom. Philippe was the son of Nicolas de Lorraine, who became Duke de Mercoeur in 1569, and was a half brother to Louise de Vaudémont, wife of Henry III of France. He succeeded to his...