Charles I de Lorraine, duc d'Elbeuf (Joinville, 18 October 1556 – Moulins, 4 August 1605) was a French noble, military commander and governor during the French Wars of Religion. The son of the most minor cadet house of the children of Claude, Duke of Guise, Elbeuf initially lacked the prominence of his cousins, however his succession to the Rieux inheritance made him important. Over the following decades he would gradually consolidate more of it under his authority, until by his death in 1605, all of the county of Harcourt belonged to the Elbeufs. A young man in 1573, he travelled with the king's brother to assume his kingship of the Commonwealth. Upon the prince's return as Henri III of France in 1574 Elbeuf would receive the honour of assuming the position of grand chamberlain during the coronation. After the establishment of the Ordre du Saint-Esprit in 1579, Elbeuf would be elevated as a knight of this chivalric body. The following year he supported the king's brother Alençon in his negotiations with the Dutch States General to assume the role of king. In the wake of these successful, if fraught, negotiations, he was nominated by Alençon as lieutenant-general of his army. Elbeuf and Alençon would travel to the Spanish Netherlands where they would relieve the besieged town of Cambrai, to much acclaim from the citizenry. Shortly after this, relations soured between Elbeuf and the prince, and Elbeuf retired back to his estates with the excuse of an illness, being refused when he offered to return the following year. In September 1581, his marquisate of Elbeuf was elevated to a peerage duchy, greatly elevating Elbeuf's social standing.