From FMG Medieval Lands database:

IVO [III] de Beaumont (-[1083/91]). Son of IVO [II] de Beaumont (-22 May 1059) and Emma (last name unknown).

• "…Ivonis filii Ivonis comitis de Bello Monte…" witnessed a charter dated to [1042/44] under which "Guanilo thesaurarius Sancti Martini" donated property[25].
• "…Yvonis filii Yvonis comitis…" subscribed the charter dated to [1049/60] which records the agreement between the abbey of Monmajour and Chartres Notre-Dame[26].
• Comte de Beaumont-sur-Oise 1070/1081.
• "…Ivonis comitis Belli Montis…" subscribed the charter dated 1071 under which "Buccardus…Corbolensium comes" donated property to the abbey of Saint-Spire de Corbeil[27].
• He founded Conflans Sainte-Honorine in 1080.
• "Mainerium, fratrem Symonis de Monte Forti" donated property, with the consent of "Simone fratre eius comiteque Belli Montis Ivonis", by charter dated to before 1091, which also names "domnus Simon, filio suo Amalrico"[28].

m firstly JUDITH, daughter of ---. She is named as wife of Ivo and mother of Adelise by Orderic Vitalis[29].

m secondly ADELAIS [de Gournay], daughter of [HUGUES de Gournay & his wife ---] (-8 Apr 1099). The primary source which confirms her parentage has not yet been identified. The Necrologium Bellimontense records the death “VI Id Apr” of “Adeledis comitissa Bellimontis”[30].

Ivo [III] & his first wife had one child:

i) ADELISE [Aelis] de Beaumont ([before 1045][31]-Rouen 11 Jul 1091, bur Saint-Evroul[32]). She is named as wife of Hugues by Orderic Vitalis, who also names her parents and ten children of her marriage[33]. She owned Peatling Magna, in the possession of Leofric in 1086 in Domesday Book[34]. m ([before 1060][35]) HUGUES de Grantmesnil, son of ROBERT de Grantmesnil & his wife Hawise --- (-in England 22 Feb 1098, bur Saint-Evroul).

Ivo [III] & his second wife had [four] children:

ii) [ADELA de Beaumont . A fragmentary chronicle of the dukes of Aquitaine names "Adellia…Yvonis filia comitis Bellimontis atque Adeliæ Comitissæ" as wife of “Willelmus…domini Philippi Franciæ Regis Camerarius” and mother of “Hugonem, Willelmum et Mahaudam”[36]. However, it should be noted that this particular source appears not to be completely reliable. Until another source emerges which corroborates Adela´s origin and marriage, it is best to treat this information with some caution. m GUILLAUME du Puy-du-Fou, son of RENAUD du Puy-du-Fou & his wife Helvise . It should be noted that, according to Europäische Stammtafeln[37], the parents of Guillaume were Galéran "Blanchard" de Senlis & his second wife Héloise de Pithiviers.]

iii) MATHIEU [I] de Beaumont (-1 Jan 1155). The primary source which confirms his parentage has not yet been identified. He succeeded his father as Comte de Beaumont.

iv) HUGUES de Beaumont . The primary source which confirms his parentage has not yet been identified. m AGNES de Croisilles, daughter of ALARD Sire de Croisilles & his wife Havide ---. The primary source which confirms her parentage and marriage has not yet been identified.

v) AGNES de Beaumont (-before 1105). The primary source which confirms her parentage and marriage has not yet been identified. m as his first wife, BOUCHARD [III] Sire de Montmorency, son of HERVE de Montmorency & his wife Agnes --- (-2 Jan [1130/32]).

--------------------------------

Yves IIl De Beaumont

Sex: M

Event(s)

Birth: abt 1005; Beaumont, Sur-Oise, Normandy, France
Death: abt 1083; Montmorency, Seine-Et-Oise, France

Father: Yves Il De Beaumont
Mother: Gisela De Chevreuse

Spouse: Adelaide De Gournay
Marriage:

Notes and Sources: None
Submission Search: 4857058-0128108131725
URL: http://gw.geneanet.org/comrade28
CD-ROM: Pedigree Resource File - Compact Disc #139

---

n.b. I cannot find any original documentation to verify that Yves ll Beaumont, Count Of Beaumont -Sur-Oise [Twin], is in fact a twin.

Erica Howton 3 Aug 2010

---

Les comtes de Beaumont-sur-Oise et le prieuré de Sainte-Honorine de Conflans, at Google Books.

Onomastik des Rolandsliedes: Namen als Schlüssel zu Strukturen, Welthaltigkeit und Vorgeschichte des Liedes at Google Books. – This book may contain more pertinent information beyond snippet view.

Ken Shelley, 20 Oct 2022

---

Name: Ivo Bellemontensis (Yves de Beamount, ll)
Sex: M
Birth: ABT 1005 in Beaumont, Provence-Alpes-Cote d'Azur Region, France 1
Death: 22 MAY 1059 in St. Leon sur Vezere, Dordogne, Aquitaine Region, France 2

Event: Peerage Beaumont, Provence-Alpes-Cote d'Azur Region, France; Count of Beaumont 2
Note: BIRTH: Born in the Normandy Region.

Father: Ivo I de Ham b: 975 in Beaumont, Provence-Alpes-Cote d'Azur Region, France
Mother: Gisele Chevreuse b: 978 in Beaumont, Provence-Alpes-Cote d'Azur Region, France

Marriage 1 Judith de Gournay b: 1008 in Beaumont, Provence-Alpes-Cote d'Azur Region, France

Children

1. Evon Ivan Bellomontensis b: 1026 in Cotentin, Cherbourg, Manche, Normandy - Lower Region, France

Sources:

1. Title: Family Tree, COMPTON'S PLACE OF GEORGIA CONNECTIONS
Author: William, will.kerr88@comcast.net
Note: www.rootsweb.com, HR-3366-STO

2. Title: Family Tree, An Olde English family
Author: Jenny S Smith, genea1987@hotmail.co.uk
Note: www.rootsweb.com, HR-2567-DEH
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=janenaus&...

---

Yves II De Beaumont
Sex: M

Event(s)
Birth: abt 1005, Beaumont, Sur-Oise, Normandy, France
Death: abt 1083, Montmorency, Seine-Et-Oise, France

Father: Yves I De Beaumont
Mother: Gisela De Chevreuse
Marriage(s)

Spouse: Adelaide De Gournay
Marriage:

Notes and Sources: None

Submission Search: 4857058-0128108131725
URL: http://gw.geneanet.org/comrade28

---

Yves III DE BEAUMONT
Birth: 1010, Beaumont, Sur-Oise, Normandy, France
Death: 1083

Father: Ivo DE COTENTIN
Mother: Gisele CHEVREUSE

Partnership with: Adelaide DE GOURNAY

Child: Agnes DE BEAUMONT Birth: 1035, Beaumont, Sur-Oise, Normandy, France
Child: Adeliza DE BEAUMONT Birth: 1037, Beaumont, Sur-Oise, Normandy, France
Child: Beatrix DE BEAUMONT Birth: 1040, Beaumont, Sur-Oise, Normandy, France
Child: Mathieu DE BEAUMONT

Ancestors of Yves III DE BEAUMONT

                 /-Yves OISE-ON-BEAUMONT

/-Ivo DE COTENTIN
| -Gelia DE VERMANDOIS
Yves III DE BEAUMONT

       -Gisele CHEVREUSE

Descendants of Yves III DE BEAUMONT

1 Yves III DE BEAUMONT

 =Adelaide DE GOURNAY

2 Agnes DE BEAUMONT
=Bouchard III DE MONTMORENCY
3 Herve DE MONTMORENCY
=Agnes DE EU
2 Adeliza DE BEAUMONT
=Hugh DE GRANDMESNIL
3 Adelina DE GRANDMESNIL
=Roger DE AUBIGNY
=(Unknown)
3 Ives DE GRANDMESNIL
=Felia DE GAUNT
3 Robert DE GRANDMESNIL
=Emma DE STUTEVILLE
=Agnes DE BAYEUX Marriage: 1118, Normandy, France
3 William DE GRANDMESNIL
3 Agnes DE GRANDMESNIL
=William DE SAYE
3 Hugh DE GRANDMESNIL
=Adeliza of MIDDLETON
3 Aubrey DE GRANDMESNIL
3 Hawise DE GRANDMESNIL
3 Rohesia DE GRANDMESNIL
3 Matilda DE GRANDMESNIL
2 Beatrix DE BEAUMONT
=Robert I DE STUTEVILLE
3 Emma DE STUTEVILLE
=Robert DE GRANDMESNIL
3 John DE STUTEVILLE
3 Robert II DE STUTEVILLE
=Erneburga FITZHUGH
3 Nicolas DE STUTEVILLE
2 Mathieu DE BEAUMONT
Source:

1. email: JoeAllison@fastmail.fm