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Deheubarth was a south-western kingdom or principality of medieval Wales. It was created in about 950 by Howell the Good ("Hywel Dda") out of the territories of Seisyllwg and Dyfed, both of which had come into his possession. Deheubarth, like several other Welsh kingdoms, continued to exist until the Norman Conquest of Wales, but constant power struggles meant that only for part of the time was it a separate entity with an independent ruler.