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Name: Kingdom of Seisyllwg

Type: Polity

Start: 681 AD

End: 920 AD

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Icon Kingdom of Seisyllwg

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Was one of several Welsh kingdoms that emerged in 5th-century post-Roman Britain.

Establishment

  • January 681: Seisyllwg was a petty kingdom of medieval Wales. It is unclear when it emerged as a distinct unit, but according to later sources it consisted of the former Kingdom of Ceredigion.
  • January 681: The region known as Ystrad Tywi is conquered by the Kingdom of Seisyllwg.

    • Chronology

    Interactive Chronologies with maps are available in the section Changes Navigation

    Disestablishment

  • January 921: In 920 Hywel merged Seisyllwg with the Kingdom of Dyfed to form the new kingdom of Deheubarth.

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