There were two different individuals with the name Pabo. The cognomen Post Prydyn is incorrectly attached to the earlier Pabo.:
|1||Dunod Fwr||Cerwyd||Sawyl Benuchel||Cadwallon Lyw|
|0||Pabo Post Prydyn||Guitcun|
|-2||Mar||Pabo (Post Prydyn)|
|-4||Coel Hen||Coel Hen|
Sawyl Benuchel is mentioned in the V. Cadoci as a tyrant who the saint dealt with for the theft of food and drink from his monastery. His cognomen means High-head or Proud. Triad 23 calls him one of the Three Arrogant Men of the Island of Britain. He is not to be confused with Sawyl Benisel whose cognomen means Low-head or Humble. He was married to Deichter, daughter of Muiredach Muinderg, King of Ulster, who died in 489, as stated in the AT. Also, according to Elis Gruffydd, his daughter was married to Maelgwn Gwynedd.
Triad 5 tells us Dunod was one of the Three Pillars of Battle of the Island of Britain and the son of Pabo Post Prydyn. His warrior character is confirmed in poetry by the words:
Dunod ap Pabo does not retreat.
Geoffrey mentions he was present at Arthur’s coronation. Triad 44 tells us he was at the battle of Arfderydd together with Gwrgi, Peredur, Cynfelyn Drwsgl (also of triad 5) and Dinogad ap Cynan Garwyn. He survived the battle and, according to the AC, died in the year 595. The B-text confirms that his father was Pabo. Various poems indicate he lived beyond Urien’s death and battled against Owain and Pasgen, sons of Urien.
Cadwallon Lyw is likely to be the king who gave land at Llancarfan to Kentigern for a monastery, as mentioned in V. Kentigerni 23.