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Ancestry.com. A genealogical abstract of descent of the family of Pierrepont from Sir Hugh de Pierrepont, of Picardy, France, A.D. 980 [webbaserad databas]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.Originaldata: Edward J. Marks. A genealogical abstract of descent of the family of Pierrepont from Sir Hugh de Pierrepont, of Picardy, France, A.D. 980. New Haven: Hoggson & Robinson, 1881.