Constance de MERSTON 
Constance de was born about 1229 in Wollaton, Northamptonshire, England. Constance de's father was Ralph de MERSTON. She was an only child. She died in 1293 in Tilsworth, Northamptonshire, England.
They had a son named John II de.
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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.