GAUTHIER de Ath, son of --- . Seigneur de Ath. m as her second husband, ADA de Roucy, widow of GEOFFROY Seigneur de Guise, daughter of HILDUIN [IV] de Montdidier et de Ramerupt Comte de Roucy & his wife Adelaide de Roucy (-bur Abbaye de Liessies). The Chronicle of Alberic de Trois-Fontaines names "Ada…de Guisia" as sixth daughter of Hilduin Comte de Roucy[38]. The Genealogiæ Scriptoris Fusniacensis names "quartam…Hilduini comitis filiam Adam" as wife firstly of "Godefridus de Guisia" and secondly of "Galterum de Aat et genuit filias; quarum una tradita est Gerardo de Audenarde, que peperit Arnulfum et Godefridum atque Heinricum et ceteros." and thirdly of "Theoderico de Avesnis"[39]. She married thirdly Thierry Seigneur d'Avesnes. Gauthier & his wife had two children