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See Peter Bartum, https://www.geni.com/documents/view?doc_id=6000000173393115923 (February 8, 2023; Anne Brannen, curator)
Please see Darrell Wolcott: Another Look at Teithfallt of Gwent; http://www.ancientwalesstudies.org/id168.html. (Steven Ferry, February 25, 2020.)
Please see Darrell Wolcott: The Lands Called Garthmadryn; http://www.ancientwalesstudies.org/id265.html. (Steven Ferry, may 4, 2021.)