Sir Gruffudd ap Iorwerth, the Wild Knight of Cae Hywel

Please ignore Wikipedia -- it presents a Sir Gruffydd who is formed from the conflation of different lines.

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5096/bleddyn... (May 27, 2017; Anne Brannen, curator) -- but be aware that Bartrum assigns Sir Gruffudd ap Iorwerth to the family of Bleddyn ap Cynfyn, a common mistake inherited from the medieval manuscripts, but which makes no sense chronologically. See Darrell Wolcott, for a discussion of three different Iorwerths ap Goch who have been conflated in the medieval manuscripts, and a proposition for how best to untangle them.

See Darrell Wolcott, "The Pedigree of Cynddelw Gam," http://www.ancientwalesstudies.org/id94.html for untangling and clarification of these lines. (February 29, 2016, Anne Brannen, curator)

Please see Darrell Wolcott: Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#196] (Steven Ferry, November 28, 2017.)

Please see Darrell Wolcott: Three Men Called Iorwerth Goch "ap Maredudd"; http://www.ancientwalesstudies.org/id140.html. (Steven Ferry, September 6, 2020.)

A Genealogical and Heraldic History of the Commoners of Great Britain and Ireland by John Burke. Volume 4.
pages 357 - 359, Kinaston of Oteley Park. https://books.google.com