Which John de Mowbray was the Brother of Christiana de Plumpton?

I'm very grateful to Douglas Hickling for permission to reproduce here his article setting out the evidence about Christiana and her three husbands, John Scot, Richard de Emeldon and Sir William de Plumpton, and discussing in detail the identification of her brother, John de Mowbray.

• Douglas Hickling, "Which John de Mowbray was the Brother of Christiana de Plumpton?" (2005)
  • Part 1
  • Part 2
  • Part 3