SIMON de Clermont, son of RENAUD Comte de Clermont-en-Beauvaisis & his [second wife Clémence ---] (-1187 or after). "…Fratris mei Symon et Stephanus" consented to the donation by "Radulfus…comes Clarimontis" to the abbey of Notre-Dame d'Ourscamp by charter dated 1162[1626]. The primary source which confirms the identity of Simon's mother has not yet been identified. Simon's absence, together with Raoul and Etienne, from the list of Comte Renaud's sons by his wife Clémence de Bar in the Genealogiæ Scriptoris Fusniacensis (see above) suggests that the two groups of brothers may have been born from different marriages, although the issue is not without doubt [1627]. This hypothesis may be corroborated by Simon and Etienne, and their sister Mathilde, subscribing Raoul's 1162 charter, without any of the other named [half-]brothers. “Radulfus comes Clarimontis” donated rights “in molendino de Levrel” to Jumièges by charter dated [5 Apr 1170/27 Mar 1171], subscribed by “Symone fratre comitis...”[1628]. “Radulfus...comes Clarimontis et dominus Britolii” reached agreement with Lannoy abbey over “feodis meis in Montania”, with the consent of “uxore mea comitissa Aeliza et filia mea Katerina et fratre meo Symone cum uxore sua Matilde”, by charter dated 1174[1629]. "Radulfus…comes Claromontensis" donated the church of Saint-Evremond de Creil to the priory of Saint-Leu d’Esserent, with the consent of "fratribus meis Hugone primicerio Metensis ecclesiæ…ecclesiæ de Credulio abate, et Simone milite fratre meo…", by charter dated 24 Feb 1176[1630]. "Symonis fratris mei, Petri Ambianensis nepotis mei" subscribed the charter dated 1178 under which "Radulfus comes Claromonensis" donated property to the abbey of Notre-Dame d'Ourscamp[1631]. Seigneur d'Ailly-sur-Noye. "Dnus Symon de Alliaco" donated property to Saint-Leu d’Esserent, with the consent of "Matildis uxor eius et filii eius Radulfus et Guido et Dnus Robertus de Bova", by charter dated to before 1191, but received 1193, signed by "Rodulfus comes de Claromonte…"[1632].
m MATHILDE de Breteuil, daughter of VALERAN [III] Sire de Breteuil-en-Beauvaisis & his first wife Holdeburge dame d'Ailly-sur-Noye et de Tartigny (-14 Mar 1208). The Chronicle of Alberic de Trois-Fontaines names "comitissam Clarimontis Belvacensis et uxorem Symonis Clarimontis et Emiciam" as the three daughters of "Alaydis [filia comitem de Brana Robertum domnum]" & her first husband[1633], although it appears chronologically unlikely for Mathilde, wife of Simon de Clermont, to have been the daughter of Valeran [III] by his second wife. The correct parentage of Alix and her sister Mathilde is confirmed by the charter dated 1153 which records that “Galerannum de Britoglio” donated property at Champmartin at Rueil-sur-Bèche to Froidmont abbey, with the consent of “Hugone fratre suo...et Holdeburge uxore Galeranni, Aalsi et Mathilde filiabus eius”[1634]. Dame d’Ailly: [the widow of her grandson] “Gertrudis domina Alliaci...Joannes filius meus” confirmed the donation of land “apud Beeleuses in decima quam emit Matilidis de Alliaco mater predicti Radulfi” made by “Radulfus de Claromonte quondam maritus meus” by charter dated 1225[1635]. “Radulfus...comes Clarimontis et dominus Britolii” reached agreement with Lannoy abbey over “feodis meis in Montania”, with the consent of “uxore mea comitissa Aeliza et filia mea Katerina et fratre meo Symone cum uxore sua Matilde”, by charter dated 1174[1636]. "Dnus Symon de Alliaco" donated property to Saint-Leu d’Esserent, with the consent of "Matildis uxor eius et filii eius Radulfus et Guido et Dnus Robertus de Bova", by charter dated to before 1191, but received 1193, signed by "Rodulfus comes de Claromonte…"[1637].
Simon & his wife had [four] children