Madog ab Iorwerth Goch, of Mawddwy

See Darrell Wolcott, http://www.ancientwalesstudies.org/id140.html, for a discussion of the descendants of three different Iorwerths Goch who are conflated in the manuscripts. (May 27, 2017; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5096/bleddyn... (May 26, 2017; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5576/Bleddyn... (May 30, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: Three Men Called Iorwerth Goch "ap Maredudd": http://www.ancientwalesstudies.org/id140.html. Wolcott notes that the 1165 Madog ap Iorwerth Goch died in 1194 without issue and that he is often confused with the Madog Goch of c. 1145, son of the Powys Iorwerth Goch. (Steven Ferry, September 6, 2020.)