Usai ap Serwyl

See Darrell Wolcott -- http://www.ancientwalesstudies.org/id158.html -- "The Royal Family of Ceredigion" for untangling of these lines. (April 25, 2016, Anne Brannen, curator)

Please see Darrell Wolcott: Early Ceredigion and its Rulers; http://www.ancientwalesstudies.org/id158.html. (Steven Ferry, September 11, 2020.)

Please see Darrell Wolcott: Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, March 11, 2021.)