Joan De+ Saint Owen 
Joan De+ was born about 1260 in Winchester, Hampshire, England. Joan De+'s father is John+ Saint Owen. She is an only child.General Notes
SOURCES: LDS Family History Library, Ancestral File #9NQF-99(familysearch.org)
"Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, F.L. J P de Palmas <Aurejac et Tournemire; Frankish line; The Complete Peerage>, Jacquier <Genealogy of Lewis Carroll, Justin Swanstrom, The Royal Families of England Scotland & Wales by Burkes Peerage; Debrett's Peerage & Baronage; Table of descendants French Canadian Genealogical Society; Families of Monfort-sur-Risle & Bertrand de Bricquebec; The Dukes of Normandy, XXXXI, , A. Brabant <"Dynastie Montmorency, Michel d'Herbigny>, Paul Leportier, Claude Barret>, H.R. Moser <Burke Peerage>, L. Orlandini, O.Guionneau, L.B. de Rouge, E. Polti, N. Danican <Britain's Royal Families; Buthlaw, Succession of Strathclyde, the Armorial 1961-62> A.Terlinden <Genealogy of the existing British Peerage, 1842>, L. Gustavsson, C. Cheneaux, E. Lodge, S. Bontron <Brian Tompsett>, R. Dewkinandan, H. de la Villarmois, C. Donadello; Scevole de Livonniere, H. de la Villarmois, I. Flatmoen, P. Ract Madoux <History of Morhange; Leon Maujean; Annuaire de Lorraine, 1926; La Galissonniere: Elections d'Arques et Rouen>), Jean de Villoutreys <ref: Georges Poull>E. Wilkerson-Theaux <Laura Little>, O. Auffray... http://geneastar.org.
"Ancestors/Descendants of Roger Wentworth", http://www.geneastar.org.
Joan De+ and Richard Plantagenet De+ were married in a religious ceremony about 1279. They had two sons and a daughter, named Edmund De+, Geoffrey De and Joan De+.
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Children
Geoffrey De Cornwall
Geoffrey De was born about 1288 in Burford, Shropshire, England; Alternate POB given. He died before June 1335 in Burford, Shropshire, England.