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Bywyn ap Byordderch

Bywyn ap ByordderchBywyn ap Byordderch. (S1,S2).
Son of Biordderch ap Gwriawn.

Note from (S3) says: HLG 12 and ABT 9b make Tudor Trevor ap Ynyr ap Cadfarch ap Gwrgeneu ap Gwaeddgar ap Bywyn ap Biordderch ap Gwriawn ap Gywnnan ap Gwnfyw Frych ap Cadell and continue with the ancestry of Cadell Ddyrnllwg of c. 380. But the Cadell in this list would occur c. 580. WIFE:

CHILDREN of Bywyn ap Byordderch:
  1. Gwaethgar Gwaeddgar ap Bywyn. (S1). (Gwaeddgar ap Bywyn-S2).