Seisyllwg was a kingdom of medieval Wales. For alternate meanings, see Wales (disambiguation) National motto: Cymru am byth (Welsh: Wales for ever) Official languages: English and Welsh Capital: Cardiff First Minister: Rhodri Morgan AM Area - Total: - % water: Ranked 3rd UK 20,779 km² xx% Population - Total (2001): - Density: Ranked 3rd UK 2,903,085 140/km² NUTS...
Seisyll (born c. 665) was a direct descendant of King Ceredig Ceredigion's eldest son, King Usai. He was a late 7th century King of Ceredigion who invaded Dyfed and managed to conquer Ystrad Towi. His enlarged kingdom became known as Seisyllwg in his honour.
Howell was able to consolidate his position by marrying Elen, whose father had ruled Dyfed until his death.
Following his father's death in 909, he acquired a share of Seisyllwg, and on his brother's death in 920, he merged Dyfed and Seisyllwg, creating for himself a new kingdom, which became known as Deheubarth.
Following the death of his cousin Idwal Foel in 942, he also seized the principality of Gwynedd, becoming ruler of about three-quarters of present-day Wales.
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