Jean VIII, Sire de Créquy, Prince de Poix, seigneur de Canaples (died 1555), left three sons, the eldest of whom, Antoine de Créquy (1535-1574), inherited the family estates on the death of his brothers at St. Quentin in 1557. He was raised to the cardinalate, and his nephew and heir, Antoine de Blanchefort, assumed the name and coat-of-arms of Créquy. Charles I de Blanchefort (1578-1638), Prince de Poix, Seigneur de Créquy, de Fressin et de Canaples, Marquis de Vizille et de Treffort, Comte de Sault, Baron de Vienne-le-Chastel et de La Tour d'Aigues, Duc de Lesdiguieres, Marshal of France and peer of France, son of Antoine de Blanchefort, saw his first fighting at Laon in 1594 and was wounded at the capture of Saint-Jean-d'Angély in 1621. In the following year, he became a marshal of France. He served through the Piedmontese campaign in aid of Victor Amadeus, Duke of Savoy in 1624, as second in command to the "Constable of France", François de Bonne, Duc de Lesdiguires, whose daughter, Madeleine, he had married in 1595. In 1626, he inherited the estates and title of his father-in-law, who had induced him, after the death of his first wife, to marry her half-sister Françoise. He was also Lieutenant-General of Dauphiné. In 1633 he was ambassador to Rome, and in 1636 to Venice. He fought in the Italian campaigns of 1630, 1635, 1636 and 1637, when he helped to defeat the Spaniards at Monte Baldo. He was killed on 17 March 1638 in an attempt to raise the siege of Crema, a fortress in the Milanese. He had a quarrel extending over years with Philip, the bastard of Savoy, which ended in a duel fatal to Philip in 1599; and in 1620 he defended Honorat de Beauvilliers, Comte de Saint-Aignan, who was his prisoner of war, against a threatened prosecution by Louis XIII. Some of his letters are preserved in the Bibliothque Nationale in Paris, and his biography was written by N. Chorier (Grenoble, 1683).