Cynhaethwy ab Adam Gwent

See Darrell Wolcott, "The Herbert Family Pedigree," http://www.ancientwalesstudies.org/id40.html (Anne Brannen, curator, January 2, 2019)

See Darell Wolcott, http://www.ancientwalesstudies.org/id40.html (September 28, 2018; Anne Brannen, curator)'

Please see Darrell Wolcott: The Herbert Family Pedigree; http://www.ancientwalesstudies.org/id40.html. (Steven Ferry, April 21, 2020.)

Please see Darrell Wolcott: Three Conflated Brecknock Families; http://www.ancientwalesstudies.org/id324.html [Fam3: # 4] (Steven Ferry, October 5, 2024.)