Back Rouantelezh Dyfed Breton Regne de Dyfed Catalan Teyrnas Dyfed Welsh Kralojstwo Dyfed DSB Reino de Dyfed Spanish Dyfedeko Erresuma Basque Royaume de Dyfed French Tiarnas Dyfed Irish Reino de Dyfed Galician Kerajaan Dyfed ID
Kingdom of Dyfed Teyrnas Dyfed (Welsh) | |||||||||
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| c. 410–920 | |||||||||
 Map showing Dyfed, after the late 7th century, showing its seven cantrefi. | |||||||||
| Common languages | Welsh, Latin, Irish[1] | ||||||||
| Government | Monarchy | ||||||||
| Historical era | Middle Ages | ||||||||
• Established | c. 410 | ||||||||
• Disestablished | 920 | ||||||||
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The Kingdom of Dyfed (Welsh pronunciation: ['dəvɛd]), one of several Welsh petty kingdoms that emerged in 5th-century sub-Roman Britain in southwest Wales, was based on the former territory of the Demetae (modern Welsh Dyfed). The royal line was founded by Irish settlers in the 5th century. After the Norman invasion of Wales Dyfed was incorporated into Pembrokeshire. The name was resurrected for the now-defunct administrative area called Dyfed as well as in the names of some regional organisations such as Dyfed–Powys Police.
Dyfed may have originally occupied the area that bordered the rivers Teifi, Gwili and Tywi, and included contemporary Pembrokeshire, the western part of contemporary Carmarthenshire, and with the town of Carmarthen. Dyfed eventually comprised at least seven cantrefi: Cemais, Deugleddyf, Emlyn, Cantref Gwarthaf, Pebidiog, Penfro and Rhos, with an approximate area of about 2,284 square kilometres (882 sq mi).
During times of strength, the kingdom expanded to additionally cover the Ystrad Tywi ("Valley of the Tywi"), including Cydweli (Kidwelly) and Gwyr (Gower; possibly under the reign of Aergol Lawhir), and even bordered Brycheiniog. Dyfed lost the Ystrad Tywi region to Ceredigion, another petty kingdom, in the late 7th century.
- ^ Charles-Edwards 2013, p. 112-4.