John I de MORTEYN & Constance de MERSTON 
They had a son named John II de.
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Personal Details
John I de MORTEYN
John I de was born about 1225 in Wollaton, Nottinghamshire, England. He died about 1265 in Evesham, Worcestershire, England.
Constance de MERSTON
Constance de was born about 1229 in Wollaton, Northamptonshire, England. She died in 1293 in Tilsworth, Northamptonshire, England.
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Children
John II de MORTEYN
John II de was born about 1245 in Tilsworth, Marsoton, Bedfordshire, England. He died in 1296 in Bedfordshire, England.