Seisyll is only here to hold the place of the unnamed king who was the grandfather of Aedd Mawr. The mention of Anthun as the son of Seiriol (Seisyllt) ap Gurgust in the "Gwyr-y-Gogledd Genealogy" is an error made by a midieval genealogist attempting to re
(continued from birth) concile various genealogical tracts. In other words, Seisyll is not Anthun's father, and Gwewst is not his grandfather.
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