As a widower Hugh IV made the prestigious marriage to Millicent (Melisende) de Coucy. The late well known author/historian Barbara Tuckman used the Coucy family as the basis for her best selling and copious work, The Distant Mirror. In the beginning, she describes Melisende's notorious father Thomas de Marla de Coucy and her grandfather Enguerrant I and her brother Enguerrand II. She also describes the importance of the strategic location of Coucy, its strength as a great bastion and why the Lords of Coucy were such a leading family of warrior knights.