John de ST. JOHN & Isabell de COURTENAY 
They had a daughter named Margaret.
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Personal Details
John de ST. JOHN
John de was born in October 1273 in Basing, Northamptonshire, England. He died at the age of 55 on May 14th, 1329.
Isabell de COURTENAY
Isabell de was born about 1283 in Okehampton, Devonshire, England. She died after May 10th, 1325.
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Children
Margaret ST. JOHN
Margaret was born about 1308 in Hatch, Somersetshire, England. She died on November 19th, 1361.