Ystrad Tywi

Ystrad Tywi is a region of southwest Wales situated on both banks of the River Tywi. Although Ystrad Tywi was never a kingdom itself, it was historically a valuable territory and was fought over by the various kings of Dyfed, Deheubarth, Seisyllwg, Gwynedd, Morgannwg and the Normans.

The Ystrad Tywi was part of the Demetae tribe during the Roman era, how it was founded in the post Roman era is unknown, theories suggest either Irish settlement or just land that was deemed worthless by the other Kingdoms until the Kingdom of Dyfed took it sometime around the 6th Century. At the start of the 8th century Ystrad Tywi was still part of the kingdom of Dyfed. Around the year 730 Seisyll ap Clydog, king of Ceredigion, captured Ystrad Tywi from Rhain ap Cadwgan, king of Dyfed, and annexed it to his own kingdom. The name Seisyllwg was given to the new enlarged kingdom. As a result, Brycheiniog was once again detached from Dyfed; Ystrad Tywi had previously joined the two.

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