y Blaidd Rhudd ap Cyllyn

Please see Darrell Wolcott: The 5 Plebian Tribes of Wales; http://www.ancientwalesstudies.org/id201.html. (Steven Ferry, January 27, 2020.)

Please see Darrell Wolcott: The Lineage of Pebid Penllyn; http://www.ancientwalesstudies.org/id288.html. (Steven Ferry, January 7, 2022.)

Please see Darrell Wolcott: Rhiryd Flaidd, Lord of Penllyn; http://www.ancientwalesstudies.org/id290.html. (Steven Ferry, February 27, 2022.)