Family:John England and Agatha De Ferrers (1)

Facts and Events
Marriage[1] BET 1188 AND 1191  Cohabitation without marriage formalities?  
Children
BirthDeath

ES III:356b credits John with two illegitimate children by Agatha de Ferrers - Joan and Richard.

"Magna Charta Barons" by Charles H. Browning, copyright 1969 (I'm unsure of the overall reliability of this source), gives Joan's mother as Agatha de Ferrers, daughter of Robert de Ferrers, fourth Earl of Derby.

References
  1. Brian Tompsett, Dept of Computer Science. University of Hull Royal Database (England). (Name: copyright 1994, 1995, 1996;).

    No date. It is known that Agatha was a mistress of John, but it is only supposition that she is the mother of his child.