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Seisyllwg

A Dictionary of Celtic Mythology | 2004 | 589 words | Copyright

Seisyllwg, Seissyllwg, Seisylwch. Gwlad or petty kingdom of early medieval Wales formed in the mid-8th century when King Seisyll ap Clydog of Ceredigion forcibly united the southern gwlad of Ystrad Tywi with his own. More than 100 years later in 871, Seisyllwg was united with Gwynedd when Seisyll's great-great-granddaughter married Rhodri Mawr. After a second brief period of independence, Seisyllwg was merged with the larger kingdom of Deheubarth when Hywel Dda annexed Dyfed. The land area of Seisyllwg is coextensive with the modern (since 1974) counties of Dyfed and West Glamorgan.

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JAMES MacKILLOP. "Seisyllwg." A Dictionary of Celtic Mythology. 2004. Encyclopedia.com. 29 May. 2012 <http://www.encyclopedia.com>.

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JAMES MacKILLOP. "Seisyllwg." A Dictionary of Celtic Mythology. 2004. Retrieved May 29, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O70-Seisyllwg.html

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