Geoffrey De Cornwall & Margaret Mortimer 
They had a son named Richard De.
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Personal Details
Geoffrey De Cornwall
Geoffrey De was born about 1288 in Burford, Shropshire, England; Alternate POB given. He died before June 1335 in Burford, Shropshire, England.
Margaret Mortimer
Margaret was born on September 14th, 1295 in Richard's Castle, Herefordshire, England. She died at the age of 50 in December 1345.
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Children
Richard De Cornwall
Richard De was born in 1311 in Burford, Shropshire, England. He died at the age of 32 in October 1343 in Burford, Shropshire, England.