Marguerite de Sully

✓ Marguerite de Sully (d. 15 Dec [1145], bur. Fecamp), daughter of Guillaume de Blois, seigneur de Sully, and Agnes de Sully; third wife of Henri I, Count of Eu, and mother of Jean I ('Margareta Augensis comitissa, mater Johannis comitis'). Her parents not wired (her father was a son of Stephen-Henry of Blois and Adela of Normandy - extendable). Source: Medieval Lands (fmg.ac, Cawley), 'Normandy, Comtes d'Aumale & d'Eu (normacre)'. [DIRECT ANCESTOR OF THE COMPILER: flag added 22 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.] CHECKED 25 Oct 2026: Medieval Lands lists her among the children of Guillaume de Blois, seigneur de Sully (grandson of the Conqueror), but she was already Countess of Eu in 1101 and Guillaume was born c.1090 - chronologically impossible; parentage left unwired.