Custennin Fendigaid Constantine "the Blessed"

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392255909 (February 6, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: Ancient Powys; http://www.ancientwalesstudies.org/id79.html. (Steven Ferry, October 8, 2019.)

Please see Darrell Wolcott: Maxen Wledig and the Welsh Genealogies; http://www.ancientwalesstudies.org/id19.html. (Steven Ferry, February 10, 2020.)

Please see Darrell Wolcott; Constans I and his A.D. 343 Visit to Britain; http://www.ancientwalesstudies.org/id131.html. (Steven Ferry, February 16, 2020.)

Please see Darrell Wolcott: Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, March 8, 2021.)

Please see Darrell Wolcott: Britain's Royal Roman Family; http://www.ancientwalesstudies.org/id141.html. (Steven Ferry, July 25, 2021.)

Please see Darrell Wolcott: Who Was Yspwys in Welsh History?; http://www.ancientwalesstudies.org/id303.html (Steven Ferry, September 30, 2022.)

Constantine (Welsh, Custennyn map Macsen), born, say about 360, the son of Roman usurper Magnus Clemens Maximus (Welsh, "Macsen Gwledig"), executed in 388.

Later legend confuses this Constantine with his namesake Constantine the Great, Emperor of Rome. The confusion seems to have arisen because of a confusion between their mothers, St. Elen Luyddog and St. Helen of the Cross. However, this Constantine lived at least a generation later than Constantine the Great.

According to one tradition, he was the Constantine who was father of Ambrosius and Uther Pendragon. Some contemporary scholars speculate he might have been identical with Roman usurper Constantine III, executed in 411.