 During the 13th century, it was restored by Odon IV of Ham who gave the fortress its definitive shape, a polygonal enceinte broken up by large cylindrical towers.Enguerrand de Coucy bought the seigneury in 1380 and his daughter sold it in 1400 to Louis d' Orléans, who integrated it into his network of fortresses which included La Ferté-Milon, Pierrefonds and Fère-en-Tardenois.Louis began the reconstruction, perfected after 1418 by John II of Luxembourg, Count of Ligny, who acquired the seigneury following Louis' assassination.