Robert de GRENTMESNIL 
Robert de was born about 1003 in Normandy, France. Robert de's father was Gervasede de GRENTMESNIL. He was an only child. He died in 1038.
They had a son named Hugh de.
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Children
Hugh de GRANDMESNIL
Hugh de was born in 1030 in Grentmesnil, Calvadosm, Normandy, France. He died in Leicestershire, England.