MATHIEU [I] de Montmorency, son of BOUCHARD [III] Seigneur de Montmorency & his first wife Agnes de Beaumont (-1160). "Dnus Bucardus de Monte Morentiaco" donated property to the abbey of Saint-Martin de Pontoise for the souls of "uxorisque suæ, filiorum filiarumque suarum" with the consent of "filium suum Mathæum" by charter dated [1102][613]. "Bocardus Munmorenci castelli dominus" donated property to Chartres Saint-Père, in the presence of "Matheo comite Belli Montis", by charter dated to before 1112, later confirmed by "Matheus filius Bocardi"[614]. Seigneur de Montmorency, de Marly, de Conflans-Sainte-Honorine et d'Attichy. "Milites, Witerus Registensis comes, Henricus comes de Grandiprato, Drogo de Petrefonte, Gualcherius de Castellione, Matheus de Montemorencii..." witnessed the charter dated 1137 which records an agreement between "Guermundus de Castellione advocatus Ruminiaci" and Compiègne Saint-Corneille[615]. "Matheus de Montemorenciaco" donated property to the abbaye du Val, with the consent of "filii mei Buchardus, Theobaldus, Matheus", by charter dated 1160[616]. The necrology of Saint-Victor, Paris records the death "V Kal Nov" of "domini Mathei de Montemorenciaco", and records his donations for the anniversaries of his parents and of "fratris eius Theobaldi"[617].
m firstly ([1126]) ALIX, illegitimate daughter of HENRY I King of England & his mistress --- (-24 Apr ----). Guillaume de Jumièges records that one illegitimate daughter of King Henry I married "Matthæo filio Burchardi de Montemorenceio"[618]. Duchesne dates the marriage to 1126 but cites no source which provides the basis for this statement[619]. The necrology of Saint-Victor, Paris records the death "VIII Kal Mai" of "Alina uxor Mathei de Montemorenciaco"[620].
m secondly (1141) as her second husband, ADELAIDE de Maurienne, widow of LOUIS VI "le Gros" King of France, daughter of HUMBERT III "le Renforcé" Comte de Maurienne et de Savoie & his wife Gisèle de Bourgogne [Comté] ([1092]-Montmartre 18 Nov 1154, bur Montmartre, église abbatiale de Saint-Pierre). Her first marriage is recorded by Orderic Vitalis, who also names her father and her four oldest sons[621]. The De Genere Comitum Flandrensium, Notæ Parisienses records "filiam Humberti comitis Morienne" as wife of "Ludovicum regem Grossum"[622]. The Chronicle of Alberic de Trois-Fontaines names "reginaAlaydis…soror Amadei comitis Sabaudie" as wife of "Ludovici Grossi"[623]. She exercised considerable influence over her husband, playing an active part in the downfall of Etienne de Garlande, Chancellor of France. After the accession of her son Louis VII in 1137, Adelaide conspired against Suger, Abbé de Saint-Denis, triggering a quarrel with her son who exiled her and her second husband to her lands in Compiègne. Her second marriage is confirmed by an undated charter which records a donation to the priory of Saint-Nicolas d’Acy, near Senlis made in the presence of "dominæ Adelæ reginæ et domini Mathei mariti eius"[624]. In 1153, sheretired to the church of the Abbaye de Saint-Pierre at Montmartre, which she had founded[625]. The necrology of the abbey of Saint-Denis records the death "XIV Kal Dec" of "Adelaidis regina"[626].