"The said Turghetil was Lord of Turquevile, Turqueray, &c. and joint guardian and governor, with his said elder brother, Touroude, to William Duke of Normandy, as before taken notice of; and at last basely murdered for his attachment to that prince. He married Adeline de Montfort, sister of Toustain Lord of Montfort sur Risle ; and by her had Anchitel, his heir; Walter de Turqueville; and Lesseiine, the wife of William Earl of Eu, Exmes, and Montreuil." [1]
Sources
↑ Collins's peerage of England; genealogical, biographical, and historical, pg 430 [1]
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Was she Turchetil Harcourt's concubine/mistress for a number of years before they married? A marriage in 1024 coincides with his death year. If the estimated birth years are right, the first two children, Walter and Alice, are too old to belong to her, and a 15-year gap separates them from the next child.