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Please see Darrell Wolcott: The Royal Family of Gwynedd - Who was Maredudd ap Cynan?; http://www.ancientwalesstudies.org/id47.html. (Steven Ferry, December 17, 2019.)
Please see Darrell Wolcott: The Floruit of Einion ap Seisyllt; http://www.ancientwalesstudies.org/id48.html. (Steven Ferry, August 10, 2020.)