Origin : Ancient Celtic,
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Additional information Seisyll:
Old Welsh form of SEXTILIUS
Wiki information Seisyll:
Llywelyn ap Seisyll was an 11th-century king of Gwynedd and Deheubarth in present-day Wales. He was noted as "King of the Britons" in the Irish Annals of Ulster.
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 plus the region known as Ystrad Tywi. Thus it covered the modern county...