Gwewst is only here to hold the place of the unnamed king who was the great grandfather of Aedd Mawr. He is said to be the son of Rhiwallon, King of Britain. The mention of Anthun as the son of Seiriol (Seisyllt) ap Gurgust in the "Gwyr-y-Gogledd Genealogy
When copying data from this family tree, please include a reference to the origin: Carolee Heynen, "Genealogy Heynen Hanson Baumberger Bartling and more", database, Genealogy Online (https://www.genealogieonline.nl/genealogy-heynen/I29551456952.php : accessed May 22, 2024), "Unnamed Great Grandfather of Aedd Mawr King of Britain".
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