Marguerite De+ Montagu 
General Notes
SOURCES: "Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, H.R. Moser <Burke Peerage>), O.Guionneau, L.B. de Rouge, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842, and E. Lodge> , Franck Veillon, B. Yeurc'h) http://www.geneastar.org.
‌Marguerite De+ and Pierre I De+ were married in a religious ceremony about 1230. They had a son named Olivier I De+.
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Children
Olivier I De+ Machecoul
Olivier I De+ was born about 1231. He died on December 18th, 1279. He was buried in Notre Dame de Villeneuve-lez-Nantes, Nantes, France.