MATHIEU [II] de Beaumont, son of MATHIEU [I] Comte de Beaumont & his wife Beatrix de Clermont (-1 Jul 1174 or after). “Matheus comes et uxor mea Beatrilidis cum filiis meis Ivone et Matheo” granted freedoms to the men of Bernes at the request of the canons of Saint-Germain-l’Auxerrois de Paris, by charter dated 1110[103]. The Genealogiæ Scriptoris Fusniacensis refers to a sister of "comes Rainaldus" as wife of "Matheus comes de Bello-monte, de qua genuit alterum Matheum comitem et fratrem eius et filias"[104]. "Mattheus comes, filius eius Matheus..." subscribed the charter dated 1136 which records an agreement between the priory of Saint-Leu d’Esserent and the inhabitants of the town regarding duties on wine[105]. Comte de Beaumont. "Mattheus comes Belli montis" exempted Saint-Leu d’Esserent from duties, with the consent of "Matheo comite patre meo et Hugone fratre meo et Mathilde comitissa uxore mea", by charter dated 1154[106]. “Matheus comes Bellimontis” granted exemption from passage duties through his county to Lannoy abbey, with the consent of “Aelidi comitissa uxore mea filiis quoque meis Matheo et Philippo”, by charter dated 1166[107]. The Necrologium Bellimontense records the death “Kal Jul” of “Matheus II comes”[108]. The necrology of the abbey of Notre-Dame du Val records the death "Kal Jul" of "Matheus comes Bellimontis"[109]. The necrology of the Priory of Saint-Martin-des-Champs records the death "Kal Jul" of "Matheus comes Bellomontis"[110].
m firstly (before 1150) MATHILDE de Châteaudun, daughter of GEOFFROY [III] Vicomte de Châteaudun & his wife Heloise Dame de Mondoubleau (-[26/27] Jun [1154/56]). “Matheus comes Bellimontis” donated property to the Templars by charter dated 1152, with the consent of “Mathildi comitissa uxore Mathei comitis, cum liberis suis”[111]. The primary source which confirms her parentage has not yet been identified. "Mattheus comes Belli montis" exempted Saint-Leu d’Esserent from duties, with the consent of "Matheo comite patre meo et Hugone fratre meo et Mathilde comitissa uxore mea", by charter dated 1154[112]. "Matheus comes Bellimontis" noted the death "VI Kal Jul" of "Matildis comitissa uxor mea" and donated property to Hôtel-Dieu, Châteaudun for her soul by charter dated 1159[113]. The Necrologium Bellimontense records the death “V Kal Jul” of “Martildis comitissa”[114]. Mathilde’s death must be dated several years before 1159 as a charter dated 1160 names her husband’s second wife as well as their two sons. "Matheus comes Bellimontis" donated property to the chapelain de la Madeleine in the church of Saint-Léonor for the soul of "patris mei Mathei et Matildis matris mee" by charter dated 1 Jan/9 Apr 1189 or 1 Jan/25 Mar 1190[115]. "Matheus comes Bellimontes" confirmed the donation by "Philippus frater meus" to the abbey of Saint-Martin de Pontoise in memory of "Mathei patris mei et Mathildis matris mee fratrumque nostrorum Mathei et Johannis sororumque nostrarum quarum ultraque dicta fuit Aalildis" by charter dated 1195[116].
m secondly ([1154/57]) as her first husband, ALIX Dame de Luzarches, daughter of --- (-8 Jan ----). “Matheus comes Bellimontis” donated property to the monks of Saint-Léonor, with the consent of “Mathei filii sui primogeniti, ceterorumque filiorum eius, Philippi, Mathei atque Johannis” and the support of “Aelide comitissa”, by charter dated 1160[117]. “Matheus comes Bellimontis” granted exemption from passage duties through his county to Lannoy abbey, with the consent of “Aelidi comitissa uxore mea filiis quoque meis Matheo et Philippo”, by charter dated 1166[118]. "Adeleidis comitissa quondam de Bellomonte nunc autem de Gornaio domina" donated property to the church of St Marie de Gournay by charter dated [1186/87], witnessed by "Matheus et Johannes filii predicte comitisse"[119]. She married secondly Amaury de Meulan Seigneur de Gournay. The primary source which confirms her second marriage has not yet been identified. The Necrologium Bellimontense records the death “VI Id Jan” of “Aales mater Johannis comitis Bellimontis”[120].
Mathieu [II] & his first wife had four children