Rhain Dremrudd was a sixth-century Welsh sovereign who ruled the kingdom of Brycheiniog. As the son of either Brychan or Cynog, he succeeded his predecessor to govern seven cantrefs. His reign was characterized by significant territorial expansion, as he successfully subjugated the kingdoms of Glywysing and Dyfed. Some historical accounts also suggest he may have held authority over Rheged. He was the father of Gwenhwyfar and is remembered as a saint within certain Christian traditions.
Life and rule
During his time as king, Rhain Dremrudd engaged in military conflicts, including an invasion of Glywysing conducted under Saint Cadoc. Following this encounter, he was reportedly rescued from captivity by the same saint. His political influence was extensive, covering multiple territories through his conquests. He eventually passed away in 510 and was laid to rest at Llandaffelog-Fach.
Veneration
Rhain Dremrudd is recognized as a saint. His legacy as a ruler and a religious figure is preserved through his commemoration in church calendars. He is specifically noted in pre-schism and orthodox traditions.