Crépy, Treaty of, 1544, concluded by Holy Roman Emperor Charles V and King Francis I of France at Crépy-en-Laonnois (formerly spelled Crespy), Aisne dept., N France. The emperor renounced his claim to the duchy of Burgundy and the king renounced his pretensions to Naples, Flanders, and Artois. In a secret treaty signed at the same time, Francis agreed to help the emperor suppress the German Protestants and to restore Geneva, where Calvin had established his state, to the duke of Savoy. He also agreed to support Charles against King Henry VIII.