Mathieu I de Beaumont-sur-Oise

   FamilySearch ID: GQG4-4XK.

Mathieu married Béatrix de Clermont, daughter of Hugues Ier de Clermont- Comte de Clermont-en-Beauvaisis and Marguerite de Ramerupt Comtesse en Clermont-En-Beauvaisis. (Béatrix de Clermont was born in 1077 in Clermont, Oise, Hauts-de-France, France and died in 1121 in Beaumont-sur-Oise, Pontoise, Val-d'Oise, Île-de-France, France.)

Mathieu next married Béatrix de Clermont, daughter of Hugues Ier de Clermont- Comte de Clermont-en-Beauvaisis and Marguerite de Ramerupt Comtesse en Clermont-En-Beauvaisis. (Béatrix de Clermont was born about 1080 in France.)