Robert de GRENTMESNIL 
Robert de was born about 0990 in Grentmesnil, Calvados, France. Robert de's father was Gervase de GRENTMESNIL. He was an only child. He died on June 17th, 1038 in France.
They had a son named Hugh de.
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Children
Hugh de GRENTMESNIL
Hugh de was born about 1030 in Normandie, France. He died on February 22nd, 1098 in Leicestershire, England.