Hyfaidd [SEP] sex or gender
later become Deheubarth, annexing Ystrad Tywi and possibly Ceredigion to Dyfed before his death. He was said to have oppressed the clerics of Meneva (modern St. David's) and exiled Bishop Nobis, earning him the enmity of Nobis's kinsman, the historian Asser.
Although later Welsh histories made Hywel Dda's inheritance of Dyfed a peaceful affair brought about by his marriage to Hyfaidd's granddaughter Elen and the extinction of Hyfaidd's male line, Asser's more contemporary Life of King Alfred reports that Dyfed or Brycheiniog both fell under
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