GUILLAUME [I] de Joigny, son of RENARD [IV] Comte de Joigny & his wife Adelaide de Nevers (-15 Feb 1220). "Willelmus comes Joigniaci" recognised the rights of the abbey of Saint-Julien d'Auxerre, in memory of "Regnaudus pater meus", by charter dated 1210[995]. Comte de Joigny. The necrology of Sens cathedral records the death "X Kal Jan" of "Guillelmus comes Joveigniaci"[996].
m firstly ([1178], divorced 1186) as her first husband, ALIX de Courtenay, daughter of PIERRE [I] Seigneur de Courtenay [Capet] & his wife Elisabeth de Courtenay ([1160]-12 Feb 1218). The Chronicle of Alberic de Trois-Fontaines refers to the sisters of "comitem Petrum Autissiodorensem et Robertum de Cortenaio et quondam Guillemum" as "Alaydis...alia mater Hugonis de Marchia in Hungaria, tertia Clementia…quarta domna de Charrosio in Bituria, quinta Constantia", specifying that Alix married firstly "comitis Guillemo Ioviniaci" by whom she was mother of "comitem Petrum" and secondly "Engolismensi comitis" by whom she was mother of "Isabellam modernam Anglie reginam"[997]. "Willermus comes Joviniaci" donated property to the abbey of Pontigny by charter dated 1180 with the consent of "uxor mea Aaleit et frater meus Gaucherius"[998]. She married secondly (1186) Aymar I Comte d'Angoulême. The necrology of Hôtel-Dieu at Provins records the death "Id Feb" of "Alesis comitissa Angolismensis"[999].
m secondly BEATRIX, daughter of --- (-11 May, 1226 or after). The necrology of Sens cathedral records the death "V Id May" of "Beatrix comitissa Jovigniaci"