Sir John Danthorpe

20 June 1294, Pardon to Catherine, late the wife of Simon le Conestable, for having, as is said prepared a poison (intoxicacom') for John de Danethorp, sometime her husband, Joan, sometime the wife of the said Simon, and Henry de Thorleye, whereof she was indicted before Hugh de Cressingham and his fellows, justices in eyre in the county of York [8].

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last updated Jan 2015

Simon Constable and Katherine were clearly married by September 1277, when Simon took control of the Estates and property of Katherine's former husband, John de Danthorp.

The Visitations of Yorkshire suggest that Katherine, daughter of Robert Cumberworth, married Simon Constable. However his wife Katherine was the daughter of Philip de Wyvelesby.

So perhaps Sir John Danthorpe was twice married:

• 1) Katherine, daughter of Robert Cumberworth
• 2) Katherine, daughter of Philip de Wyvelseby

apparently incorrect

From Dugdale's Visitation of Yorkshire, with Additions, Parts 5-7 (Google eBook) Sir William Dugdale W. Pollard & Company, 1901 - Yorkshire (England)

VI. SIR SIMON CONSTABLE, of Halsham, mentioned in an Inquisition 1275, d. 22 Edward I, Inq. P.M 10 Apr. 1294 (Yorks. Inquisitions, Rec. Ser., xxiii, 160);

mar. Katherine, dau. of Robert Cumberworth, rel. of Sir John Danthorpe.

They had issue—

1. Robert (VII).
2. Ela, mar. John Fauconberg.
3. Herneburgh.