Curt Hofemann, curt_hofemann@@yahoo.com, in a post-em writes:
"The evidence... suggests that Margery married Giles before 1239 and lived until 1267, when Giles is mentioned, but was probably dead by c.1274, when her son Reginald appears (there is no doubt that Reginald was of age by 1267). Judging by Jordan de Sackville's Oxfordshire Inquisition Post Mortem, and others quoted by Phillips, his son Andrew was born 9 October 1253, at which date Margery was certainly married to Giles de Argentein. Andrew de Sackville does not appear in connection with the property until c.1282 (although Blomefield (vol.2, pp.181,183; vol.8, pp.412,413) gives some references vaguely dated 'temp.Henry III', in fact they must be later). The later records quoted by Phillips must be in error (Andrew perhaps being changed from 'successor' of Margery into her 'heir').
One other feature of Margery's (who married Giles de Argentein) ancestry disclosed by the evidence above is that her mother was Margery, the daughter of William de Fresney, and not, as usually stated, Agatha, the daughter and coheir of Fulk de Beaufo (Blomefield, vol.2, p.178, vol.8, pp 412,413; Farrer, vol.3, p.111). Note that Phillips makes this Agatha the mother, not the wife, of Robert Aguillon, which would resolve the problem.
Blomefield = F.Blomefield, An Essay Towards a Topographical History of the County of Norfolk; continued by C.Parkin (2nd edn, 1805-10).
Farrer = W.Farrer, Honors and Knights' Fees (1923).
Phillips = C.J.Phillips, History of the Sackville Family (1929), vol.1, p.61." [Ref: The marriage of Giles de Argentein to Margery, daughter of Robert Aguillon http://www.medievalgenealogy.org.uk/families/arg/argbiog.shtml]
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Note: Jordan de Sackville also m. a Margery de Aguillon, who is a different person than this Margery (a cousin), although they lived approximately the same time (but were simultaneously married to two different husbands).