 Complete the following phrase:  The son of Jean III dHarcourt and Alix de Brabant, Jean IV, first comte dHarcourt, marries Isabeau de Parthenay. Their sons Guillaume dHarcourt is the seigneur of La Ferté-Imbault. From his marriage to Blanche de Bray, Dame de Cernon, they had one daughter, Jeanne dHarcourt, Dame de La Ferte-Imbault, who married Hugues de Montmorency. Their sons, Louis and Antoine, died at the 