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Lawrie. Annals, 2, citing William de Newburgh [William as earl of Northumberland...
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Lawrie. Annals, 2, citing William de Newburgh [William as earl of Northumberland had used Warene as his surname, lacking a patronymic.] RRS, ii, nos. 1,2 cited in Chandler, Victoria. “Ada de Warenne,Queen Mother of Scotland (c. 1123-1178).” The Scottish Historical Review 60, no. 170 (1981), p. 133, available at jstor.