Guillaume I dit "L’Achille de son temps" DES BARRES Seigneur d’Oissery-les-Meaux et de Saint-Pathus
- Married: Abt 1170
 
- Died: Between 1177 and 1182
 
 
 
     Research Notes:
 "Guy vicomte de Dampmartin" donated property to the nuns of Noëfort, confirmed by charter dated 1177, which also records donations made by "Guillaume des Barres, pelerin en Jherusalem […H. sa femme, Guillaume son ainsné filz et ses autres filz]" witnessed by "…Thibault de Crespy", and by "Pierre vicomte de Crecy" with the consent of "Thibault son filz". 
 
 
     Marriage Information:
Guillaume married Hélissende DE CHAUMONT vicomtesse de Sens, dame de Chaumont-sur-Yonne.., daughter of Geoffroi DE SAINT-BRIS seigneur de Saint-Maurice-Thizouaille and Reine DE TOUCY, about  1170.  (Hélissende DE CHAUMONT vicomtesse de Sens, dame de Chaumont-sur-Yonne.. was born about  1145.) 
 
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