Walter de Gaunt, d. 1139, held barony of Folkingham, co. Lincoln, a commander in the battle of the Standard 1138, founder of Bridlington Priory, co. York before 1113-4; m. by 1120 Maud (or Matilda) of Brittany, daughter of Stephen I, Count of Brittany. [Ancestral Roots]
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Sir Walter de Lindissi or Lind(e)say (almost certainly 3rd son of Gilbert de Ghent) probably accompanied David, Earl of Huntingdon, subsequently King David I, in his anglicising of the Lowlands in the early 12th century; he was witness 1116 to an inquisition concerning the see of Glasgow. [Burke's Peerage]
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Note: It is not obvious from the descriptions, but apparently Walter de Gaunt/Gant of Folkingham & Walter de Lindesay, whose son William de Lindsay of Fordington, Lincs. founded the Lindsay line of Scotland, are one and the same person. At least they are both named Walter and sons of Gilbert de Gant/Ghent. I presume, given Walter's rather late marriage to Maud of Brittany, that he either had a 1st wife or a mistress who was mother of William de Lindsay.