N.N. ferch John fitz Thomas

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5548/Osbwrn%... (April 7, 2017; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5548/Osbwrn%... (April 7, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: Osbwrn Wyddel of Cors Gedol; http://www.ancientwalesstudies.org/id203.html. (Steven Ferry, August 30, 2020.)

Please see Peter Bartrum: Gruffudd ap Cynan 5; https://www.geni.com/documents/view?doc_id=6000000173392536826 & Osbwrn 1; https://www.geni.com/documents/view?doc_id=6000000173392791905 (Steven Ferry, October 29, 2023.)

Corrected based on charting provided by Darrell Wolcott, Center for the Study of Ancient Wales, showing that Bartrum conflated 2 men named Cynwrig in this family. Both had a son named Dafydd Llwyd. (Steven Ferry, October 29, 2023.)