Hugh IV, Count of Rethel (1244-1285) was a son of Manasses V and his wife, Elisabeth of Écry. In 1272, he succeeded his father as Count of Rethel.Hugh IV was married to: Agnes of Chiny Marie of Enghien Isabella of GrandpréWith Isabella, he had a daughter, Joan, Countess of Rethel, who succeeded him. In 1290, Joan married Louis I, Count of Flanders.