Yvonne Sylvie De Rays 
Yvonne Sylvie De was born in 1712. She died at the age of 28 on July 15th, 1740.General Notes
SOURCES: "Ancestors/Descendants of Royal Lines" (Contributors: Reynaud de Paysac, H.R. Moser <Burke Peerage>), O.Guionneau, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842>)
Yvonne Sylvie De and Guy Auguste De were married in a religious ceremony on February 8th, 1729. They had a son named Louis De.
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Children
Louis De Rohan-Chabot
Louis De was born on April 20th, 1733. He died at the age of 74 on October 29th, 1807.