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图：AlexD · CC BY-SA 3.0 · 维基共享资源
The Kingdom of Dyfed, 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. 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.
摘自英文维基百科（原文为英文）「Kingdom_of_Dyfed」，按 CC BY-SA 4.0 使用