N.N. Picot de Say

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5210/Bleddyn... (June 19, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: Henry, the Forgotten Son of Cadwgan ap Bleddyn; http://www.ancientwalesstudies.org/id117.html. (Steven Ferry, April, 22, 2017.)

Please see Darrell Wolcott: The Royal Family of Gwynedd - History of Gruffudd ap Cynan, a New Perspective; http://www.ancientwalesstudies.org/id46.html. (Steven Ferry, December 1, 2019.)

Please see Darrell Wolcott: The Royal Family of Gwynedd - The Unofficial "History" of Gruffudd, Nephew of Iago; http://www.ancientwalesstudies.org/id74.html. (Steven Ferry, December 4, 2019.)

Please see Darrell Wolcott: Henry, the Forgotten Son of Cadwgan ap Bleddyn; http://www.ancientwalesstudies.org/id117.html. (Steven Ferry, April 5, 2020.)

Please see Darrell Wolcott: Kingship of Gwynedd - 1170 to 1175: http://www.ancientwalesstudies.org/id301.html (Steven Ferry, September 8, 2022.)