Demetae
Iron Age and Roman-era Celtic people in southwest Wales / From Wikipedia, the free encyclopedia
The Demetae were a Celtic people of Iron Age and Roman period, who inhabited modern Pembrokeshire and Carmarthenshire in south-west Wales. The tribe also gave their name to the medieval Kingdom of Dyfed, the modern area and county of Dyfed and the distinct dialect of Welsh spoken in modern south-west Wales, Dyfedeg.