The family, since its first appearance in history in the person of Bouchard I of Montmorency in the 10th century, has furnished six constables and twelve marshals of France, several admirals and cardinals, numerous grand officers of the Crown and grand masters of various knightly orders. Henry IV of France once said, that if ever the House of Bourbon should fail (i.e., become extinct), no European family deserved the French crown better than the House of Montmorency. Bouchard I's son Thibaud of Montmorency was the ancestor of the lords of Montlhéry.[1]

Matthieu I of Montmorency received in 1138 the post of constable, and died in 1160. His first wife was Aline, the natural daughter of Henry I of England; his second, Adelaide de Maurienne, widow of Louis VI and mother of Louis VII, and according to Duchesne, he shared the regency of France with Suger, during the absence of the latter king on the Second Crusade.

MATHIEU [I] de Montmorency

http://fmg.ac/Projects/MedLands/PARIS%20REGION%20NOBILITY.htm#Mathi...

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][248].  "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"[249].  Seigneur de Montmorency, de Marly, de Conflans-Sainte-Honorine et d'Attichy.  "Matheus de Montemorenciaco" donated property to the abbaye du Val, with the consent of "filii mei Buchardus, Theobaldus, Matheus", by charter dated 1160[250].  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"[251].  

m firstly ([1126]%29 ALIX, illegitimate daughter of HENRY I King of England & his mistress --- (-24 Apr ----). Guillaume de Jumièges records one illegitimate daughter of King Henry I as wife of "Matthieu fils de Burchard de Montmorency"[252]. Duchesne dates the marriage to 1126 but cites no source which provides the basis for this statement[253]. The necrology of Saint-Victor, Paris records the death "VIII Kal Mai" of "Alina uxor Mathei de Montemorenciaco"[254].

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 [Comt%C3%A9] ([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[255]. The De Genere Comitum Flandrensium, Notæ Parisienses records "filiam Humberti comitis Morienne" as wife of "Ludovicum regem Grossum"[256]. The Chronicle of Alberic de Trois-Fontaines names "regina Alaydis…soror Amadei comitis Sabaudie" as wife of "Ludovici Grossi"[257]. Crowned Queen of France at Notre-Dame de Paris [Apr/May] 1115. 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"[258]. In 1153, she retired to the church of the Abbaye de Saint-Pierre at Montmartre, which she had founded[259]. The necrology of the abbey of Saint-Denis records the death "XIV Kal Dec" of "Adelaidis regina"[260].

Mathieu [I] & his first wife had [six] children

1. [HENRI (-24 Jul before 1160). The necrology of the abbey of Notre-Dame du Val records the death "IX Kal Aug" of "Henricus de Montemorenciaco"[261]. Duchesne names Henri as oldest son of Mathieu [I] Seigneur de Montmorency, citing only this necrology entry which gives no indication either of his parentage or the timeframe during which he lived[262].]

2. BOUCHARD [IV] (-Jerusalem 1189, bur Abbaye du Val). The Chronicon Hanoniense names "nobili Buchardo de Montemorenciaco…filium Matheum et filiam Rogerus, Reinaldi de Roseto frater…comitis Hanoniensis consobrinus"[263]. "Matheus de Montemorenciaco" donated property to the abbaye du Val, with the consent of "filii mei Buchardus, Theobaldus, Matheus", by charter dated 1160[264]. Seigneur de Montmorency, Seigneur de Conflans-Sainte-Honorine et d'Hérouville. "Bucardus de Monte Morenciaco" donated money to Notre-Dame des Vaux de Cernay by charter dated to [1160/77], witnessed by "Teobaldo fratre meo, Matheo fratre meo…"[265]. Seigneur d'Ecouen 1183. "Buccardus de Montemorenciaco" confirmed donations made by "Guibertus de Tauerni…" to l´abbaye du Val, with the consent of "fratres mei Theobaldus et Matheus et Herveus clericus, uxorque mea Laurentia et filius meus Matheus et filia mea Eva", by undated charter[266]. The necrology of the abbey of Notre-Dame du Val records on "XVI Kal Dec" that "Bucardus avus, Bucardus, Theobaldus de Montemorenciaco" died in Jerusalem[267], although it is not clear to which of the three deaths the date relates. m (1173) as her second husband, LAURETTE de Hainaut, widow of DIRK van Aalst, daughter of BAUDOUIN IV Comte de Hainaut & his wife Alix de Namur (-9 Aug 1181, bur Abbaye du Val). The Chronicon Hanoniense names (in order) "Yolandem, Agnetem, Lauretam" as the daughters of "Alidis comitissa Hanonensis …cum viro Balduino comite", specifying that Laurette married "Theodericus de Alost, Iwani de Gandavo et Laurete filius" and secondly "in Francia Bucardo de Monte Morenciaco…filium Matheum", recording in a later passage that her second marriage took place "1173 post atavam epiphanie"[268]. The Chronicle of Alberic de Trois-Fontaines names (in order) "comitem Balduinum, Henricum de Seburgo et quatuor sorores" as children of "comiti Balduini de Haynaco", naming one daughter (third among those listed) "Loreta [uxor] Buchardo de Montinorencei" by whom she had "Matheum in curia Francie nominatissimum et comitissam Montisfortis matrem comitis Almarici"[269]. The necrology of the abbey of Notre-Dame du Val records the death "V Id Aug" of "domina Laureta de Montemorenciaco"[270]. Bouchard [IV] & his wife had five children:

a) MATHIEU [II] "le Grand" (-24 Nov 1230). The Chronicle of Alberic de Trois-Fontaines names "Matheum in curia Francie nominatissimum et comitissam Montisfortis matrem comitis Almarici" as children of "Loreta [de Haynaco] [uxor] Buchardo de Montinorencei"[271]. Seigneur de Montmorency, d'Ecouen, de Conflans-Sainte-Honorine et d'Attichy. Connétable de France 1194.

- see below.

b) EVA . "Buccardus de Montemorenciaco" confirmed donations made by "Guibertus de Tauerni…" to l´abbaye du Val, with the consent of "fratres mei Theobaldus et Matheus et Herveus clericus, uxorque mea Laurentia et filius meus Matheus et filia mea Eva", by undated charter[272].

c) THIBAUT . The primary source which confirms his parentage has not yet been identified. He is not mentioned by Duchesne. [1220].

d) ALIX (-25 Feb 1221, bur Abbaye de Haute-Bruyère). The Chronicle of Alberic de Trois-Fontaines names "Matheum in curia Francie nominatissimum et comitissam Montisfortis matrem comitis Almarici" as children of "Loreta [de Haynaco] [uxor] Buchardo de Montinorencei"[273]. "Symon comes Leycestrie dominus Montisfortis…Biterrenensis et Carcasonensis vicecomes" donated property to Notre-Dame de la Trappe with the consent of "A comitissa uxore mea et filiis nostris A et G" by charter dated Jul 1212[274]. The necrology of Port-Royal records the death "V Kal Jan" of "Alix comtesse de Montfort"[275]. The necrology of Haute-Bruyère lists members of the Montfort family who are buried in the abbey, including "…conte Simon…qui mourut en Albigeois et de la contesse Alix sa femme…"[276]. m ([1190]%29 SIMON [V] Sire de Montfort, son of SIMON [IV] Sire de Montfort & his wife Amicie of Leicester ([1170]-killed in battle Toulouse 25 Jun 1218, bur Abbaye de Haute-Bruyère). Earl of Leicester. Duc de Narbonne, Comte de Toulouse.

e) JEANNE . The primary source which confirms her parentage has not yet been identified. She is not mentioned by Duchesne. [1220].

3. THIBAUT (-Jerusalem after 1189). "Matheus de Montemorenciaco" donated property to the abbaye du Val, with the consent of "filii mei Buchardus, Theobaldus, Matheus", by charter dated 1160[277]. "Theobaldi domini castri de Marli" confirmed donations made by "avo suo Bucardo" to "ecclesiæ S. Eugenii de Diogillo", by charter dated 1160, witnessed by "domino Bucardo fratre suo"[278]. "Bucardus de Monte Morenciaco" donated money to Notre-Dame des Vaux de Cernay by charter dated to [1160/77], witnessed by "Teobaldo fratre meo, Matheo fratre meo…"[279]. Seigneur de Marly. "Theobaldus Marliensis dominus" donated property to Notre-Dame des Vaux de Cernay by charter dated 15 Aug 1173[280]. He joined the crusade in 1173. He became a Cistercian monk at Notre-Dame du Val in [1177]. The necrology of the abbey of Notre-Dame du Val records on "XVI Kal Dec" that "Bucardus avus, Bucardus, Theobaldus de Montemorenciaco" died in Jerusalem[281], although it is not clear to which of the three deaths the date relates.

4. HERVE (-25 Mar 1192). "Burchardus dominus Montismorenciaci" confirmed the grant of property made by "frater meus Theobaldus de Marliaco, assumpto peregrinationis Hierosolimitane" to "Herveo fratri meo" by charter dated 1173[282]. Abbot of Saint-Martin de Montmorency 1174. Deacon at Paris 1184.

5. MATHIEU (-Constantinople 27 Aug 1204). "Matheus de Montemorenciaco" donated property to the abbaye du Val, with the consent of "filii mei Buchardus, Theobaldus, Matheus", by charter dated 1160[283]. "Bucardus de Monte Morenciaco" donated money to Notre-Dame des Vaux de Cernay by charter dated to [1160/77], witnessed by "Teobaldo fratre meo, Matheo fratre meo…"[284]. Seigneur de Marly et d'Attichy.

- SEIGNEURS de MARLY.

6. [AELIS (-22 Feb ----). The primary source which confirms her parentage and marriage has not yet been identified. She is not mentioned by Duchesne. m GASCE de Poisy, son of --- (-14 Aug 1189).]

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Matthieu I de Montmorency (died 1160) was lord of Montmorency, Marly, Conflans-Sainte-Honorine and Attichy. He was also Constable of France from 1138 to 1160 under Louis VII.
He was the eldest son of Bouchard IV de Montmorency and Agnes de Beaumont-sur-Oise. In 1126 he married Alice FitzRoy, illegitimate daughter of King Henry I of England, and had the following issue:

• Henri, died young before 1160
• Bouchard V de Montmorency,(d. 1189 in Jerusalem), who married in 1173 Laurette of Hainaut (d. ..9 August 1181), daughter of Count Baldwin IV of Hainaut.[2] They had a son Matthieu II de Montmorency, nicknamed the Great.
• Theobald de Montmorency, seigneur de Marly, he went on crusade in 1173. He died as a Cistercian monk sometime after 1189.
• Herve de Montmorency, abbot of Saint-Martin de Montmorency, then deacon of the Church and dean of Paris before his death in 1192.
• Matthieu de Montmorency (d. Constantinople 1204), he inherited the lordship from his brother Theobald.

Alix died before 1141 when her husband married his second wife Adelaide of Maurienne, the widow of Louis VI of France.

References

L'epousa de Simon de Montfort, et la croisade albigeoise, Monique Zerner, Femmes, mariages, lignages – XIIe-XIVe siècles: Mélanges offerts à Georges Duby, ed. Georges Duby,(De Boeck-Wesmael, 1992), 449 note1.

L'epousa de Simon de Montfort, et la croisade albigeoise, Monique Zerner, 449.

Adelaide of Savoy, John Bell Henneman, Jr.,Medieval France: An Encyclopedia, ed. William W. Kibler and Grover A. Zinn, (Routledge, 1995), 7.

https://en.wikipedia.org/wiki/Matthieu_I_of_Montmorency