Gruffudd Derwas ap Meurig Llwyd

See Peter Bartrum. https://www.geni.com/documents/view?doc_id=6000000173426980963 Stanley (2) of Ewlo (May 7, 2024; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5256/cydifor... (December 23, 2020; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5216/Bleddyn... (June 29, 2017; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4950/bleddyn... (June 28, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: Cadwgan of Nannau; http://www.ancientwalesstudies.org/id66.html. (Steven Ferry, July 16, 2020.)

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He attacked Glyndwr after Glyndwr had killed his brother Hywel Sele, but survived, and was still alive in 1418; see https://books.google.com/books?id=aepTGZpT1FMC&pg=PA60-IA1&dq=gruff...

He is recorded in a Michalmas roll of Peniarth during the fourth year of the reign of King Henry V (1390) and was a Foreman of a Dolgelly Jury during the thirtieth year of the reign of King Henry VI (1451). citing "Powys-Land Club, issuers," Collections Historical & Archaeolological Relating to Montgomeryshire and its Borders, Pedigree of the Family of Griffith of Glyntwymin, printed in London by Thomas Richards, 1878, pgs. 42-4 (Google EBOOK web page extracted May 22, 2019 by C.S. Russak, III)