Kingdom of Seisyllwg (Q2456191)

Summary from English Wikipedia (enwiki)

Seisyllwg (Welsh: [sɛiˈsəɬʊɡ]) 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 of Ceredigion, part of Carmarthenshire, and the Gower Peninsula. It is evidently named after Seisyll, king of Ceredigion in the 7th or early 8th century, but it is unknown if he was directly responsible for its establishment. In the 10th century Seisyllwg became the centre of power for Hywel Dda, who came to rule most of Wales. In 920 Hywel merged Seisyllwg with the Kingdom of Dyfed to form the new kingdom of Deheubarth.

Summary from Cymraeg / Welsh Wikipedia (cywiki)

Roedd Seisyllwg yn deyrnas yn ne-orllewin Cymru, fu'n bodoli o tua 730 hyd 920.

Wikidata location: 53.2333, -4.0167 view on OSM or edit on OSM

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political territorial entity (Q1048835) political_division
administrative territorial entity (Q56061) boundary=administrative