Ystrad Tywi

Ystrad Tywi (Welsh: [ˈəstrad ˈtəwi], Valley of the river Towy) is a region of southwest Wales situated on both banks of the River Towy (Welsh: Afon Tywi), it contained places such as Cedweli, Carnwyllion, Loughor, Llandeilo, and Gwyr (although this is disputed).

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.

[citation needed] Eginawc (comprising the commotes Gŵyr, Carnwyllion and Kidwelly) which was fought over many times between the Welsh and the Normans in the 11th century, and for the rest of the Middle Ages only the other two cantrefi formed Ystrad Tywi.

Ystrad Tywi was transformed into the county of Carmarthen when King Edward I enacted the Statute of Rhuddlan in 1284 following the success of his war against Llywelyn ap Gruffudd, Prince of Wales.

Though Gŵyr had by now become part of Glamorgan, the rest of Eginawc was later restored to Ystrad Tywi, which was joined with Gwarthaf (except Efelfre) to form the modern county of Carmarthenshire.