- John Diffley John is, I believe, the common ancestor of most of the Diffleys covered in this study. He is certainly the ancestor of the author of this study but must not be confused with the man designated as John Diffley Junior on Griffith's Valuation.
- Mary Diffley Mary was grandmother of the compiler of this history
- Peter Collum (1870-1950) While only a 'Diffley' by marriage, Peter is included here because of the somewhat gruesome death he suffered