Isabeau, dame de Roquemont, was born about 1430 the daughter of Simon Morhier and his second wife Jeanne de Laigny. She married Guy LeBouteillier about 1450, whose widowed mother Catherine de Gavre had married Isabeau's widowed father Simon Morhier. Two sons Guy and Jean are known who were heirs to their uncle Guillaume Morhier’s estates.
Research notes
The Table d’ascendance de Catherine Baillon cites the sources for Isabeau’s family connections.[1]