Gilles De Chavagnac 
Gilles De was born on October 16th, 1709. He died at the age of 31 on November 16th, 1740 in Jamaica.General Notes
SOURCES:"Ancestors/Descendants of Royal Lines" (Contributors: M. Thompson, Reynaud de Paysac, H.R. Moser <Burke Peerage>), F.L. Jacquier, O.Guionneau, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842, L. Orlandini, R. Dewkinandan, and E. Lodge>).
Also: "Ancestors of Valery Giscard d'Estaing", http://www.geneastar.org