Richard de CORNWALL & Joan ST. OWEN 
They had a son named Geoffrey de.
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Personal Details
Richard de CORNWALL
Richard de was born in 1252 in Berkhamstead, Herefordshire, England. He died at the age of 44 in 1296 in Seige of Berwick, Berwickshire, England.
Joan ST. OWEN
Joan was born about 1255 in Winchester Buckley, Hampshire, England. Joan is no longer alive.
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Children
Geoffrey de CORNWALL
Geoffrey de was born about 1288 in Manor of Thunnock, Lincolnshire, England. He died before June 1335 in Burford, Shropshire, England.