Margaret de Rie 
Margaret de was born about 1076 in Rycott, Oxfordshire, England. Margaret de's mother was Rohese FitzRichard de Clare. Her maternal grandparents were Richard FitzGilbert 1st Earl de Clare and Rohese Giffard. She was an only child. She died in England.
‌Margaret de and William de were married in a religious ceremony about 1083 in England. They had a son and a daughter, named Geoffrey de and Beatrice de.
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Children
Geoffrey de Mandeville , 1st Earl of Essex
Geoffrey de was born in 1092 in Great Waltham, Essex, England. He died at the age of 52 on September 14th, 1144 in Mildenhall, Suffolk, England.
Beatrice de Mandeville
Beatrice de was born in 1105 in Manneville, Seine-Inferieure, Normandy, France. She died before April 19th, 1197 in Rickling, Essex, England. She was buried in Walden Abbey, Hertfordshire, England.
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