Simon I de Montfort ^{1 2 3}

   Other names for Simon were Simon I kEEP Seigneur of Montfort l'Amauri and Simon de Montfort.

  Research Notes:

From Wikipedia - Simon I de Montfort :

Simon I de Montfort born about 1025 in Montfort l'Amaury , Ile de France , France and died 1087 . He is buried in Epernon , Normandy , France. He was the son of Amaury de Montfort (c 1000-1031) and Bertrade de Gometz .

Progeny
Simon I first married Isabel de Broyles (b. 1034, Broyes, Marne, France), daughter of Hugh Bardoul. Their children were:
Amauri de Montfort (c. 1056-1089)
Isabel (Elizabeth) de Montfort (b. 1057), who married Raoul II de Tosny .[1]
Simon I's second marriage was to Agnes d'Evreux (b. 1030), daughter of Richard d'Evreux of Rouen, Normandy. Their children were:
Bertrade de Montfort (c. 1059-1117), became Queen of France.
Richard de Montfort (c. 1066-1092), slain in attack on abbey at Conches.
Simon II de Montfort (c. 1068-1101)
Amaury III of Montfort (c. 1070-1137), married Richude (Richilde) de Hainault and Agnes de Garland.
Guillaume de Montfort (c. 1073-1101)
Adeliza de Montfort (b. 1075)[2]

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From Wikipedia - Épernon :

Épernon is a commune in the Eure-et-Loir department and Centre region of France . It lies some 27 km northeast of Chartres , at the confluence of the Drouette and the Guesle .

History
Épernon was originally the home of the counts of Montfort and Amaury . In the 11th century, they raised the fortresses of Épernon and Montfort for the protection of the Château de St Léger and granted a charter to the town. Four doors gave access to the medieval city: the door of Chartres, the door of Geolle, the door of Paris and the door of Beauce . Above the doors an inscription paid homage to the village that previously existed there: Autrist fut jadis mon nom/A présent on me nomme Espierremont (Autrist was once my name/now my name is Espierremont). Charters of the 12th and 13th century variously refer to the town as Sparno and Sparnonum, but by the 14th century it had evolved to Esparnon and Espernon, very close to its present appellation.

In the 13th century it became an independent lordship, which remained attached to the crown of Navarre till, in the 16th century, it was sold by Henry III of France to Jean Louis de Nogaret de La Valette , for whom it was raised to the rank of a duchy in 1581. De Nogaret's second son, Bernard (1592-1661), succeeded his father to the dukedom and after his death, the title was borne by the families of Goth and of Pardaillan .

Simon married Agnes d'Évreux, daughter of Richard d'Évreux Count of Évreux and Adaele de Toni, about 1058 in Normandy, France. (Agnes d'Évreux was born about 1030 in Évreux, (Eure), Normandy, France.)

Simon next married Isabel de Broyes, daughter of Hugh Bardoul and Unknown, about 1055 in France. (Isabel de Broyes was born about 1034 in Broyes, (Marne), (Champagne-Ardenne), France.)