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Son of Uchdryd ab Aleth and Margred verch Cydifor Fawr Father of Uchdryd ap Aleth Brother of Iorwerth ab Uchdryd and Gwrgeneu ab Uchdryd, Abbot of Llythllawr
Please see Darrell Wolcott: Llowdden Hen of Ulwch Aeron; http://www.ancientwalesstudies.org/id262.html. (Steven Ferry, march 20, 2021.)