SEISYLL ap CLYDOG (fl. 730), first king of the combined realm of Ceredigion and Ystrad Tywi

According to early pedigrees he was a descendant of Ceredig ap Cunedda Wledig who is assumed to have been the first Brythonic ruler of Ceredigion to which he gave his name. At first king only of Ceredigion, Seisyll later added to his kingdom those parts of ancient Dyfed known as Cantref Mawr, Cantref Bychan, and Cantref Eginog, or collectively as Ystrad Tywi. Hence the name Seisyllwg was often applied to the enlarged dominion created by Seisyll, the Deheubarth of the central period of the Middle Ages possessed by the descendants of Cadell ap Rhodri the Great. Dynastic continuity was maintained in this area by Rhodri's marriage to Angharad, a sister of Gwgon ap Meurig, the last king of the old line of Seisyllwg (died 871), who were both great-great-grandchildren of Seisyll.

Author

• Professor Thomas Jones Pierce, (1905 - 1964)

Sources

• J. E. Lloyd, A History of Wales from the Earliest Times to the Edwardian Conquest (London 1911), Vol. I
• J. E. Lloyd, A History of Wales from the Earliest Times to the Edwardian Conquest (London 1911), Vol. II

Further Reading

• Wikipedia Article: Seisyll ap Clydog

Additional Links

• Wikidata: Q3477940

Published date: 1959

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