Herve IV De Leon 
Herve IV De was born about 1225. Herve IV De's father was Herve III De Leon and his mother is Marguerite De Chateauneuf-En-Thimerais. His paternal grandfather was Herve II De Leon and his paternal grandmother is Anne De Hennebont. He was an only child. He died about 1281.General Notes
SOURCES: LDS FHL Ancestal File # (familysearch.org)
"Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, F.L. 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, Paul Leportier>, H.R. Moser <Burke Peerage>, L. Orlandini, O.Guionneau, L.B. de Rouge, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842>, L. Gustavsson, C. Cheneaux, E. Lodge, S. Bontron <Brian Tompsett>, R. Dewkinandan, C. Donadello) http://geneastar.org.
(NOTE: Herve has two entries on the site, one with wfe Catherine Laval and one with wife Mahaut De Poissy. His mother is Marguerite de Dinan (Marguerite de Chateauneuf en Thimerais) on one of the listings, so it would appears that there are two marriages in this family group. For now, I am treating it as such, pending further research.)
"Ancestors/Descendants of Marguerite d'Enghein" (m. Jean de Luxembourg) http://www.geneastar.org,
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Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.1100 d.1169
- b.1130 d.11 Sep 1179
- b.~ 1105
- b.~ 1168 d.1208
- b.~ 1106 d.1190
- b.> 1151 d.~ 1208
- b.~ 1131
- b.~ 1183 d.23 Nov 1218
- b.~ 1085 d.1128
- b.~ 1110 d.1168
- b.~ 1085
- b.~ 1155
- b.~ 1130
- b.~ 1200 d.1241
- b.~ 1183
- b.~ 1225 d.~ 1281
- b.~ 1206
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They had two daughters named Constance De and Anne De.
They had a son named Herve V De.