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.