From the similarity of the names it is possible that Pepiau and Pabiali, the son of Brychan, were the same person, which would make Dubricius a great-grandson of Brychan — a great distance between the respective eras. Dubricius' mother could not have been the daughter of Meyrig, the son of Tewdrig, as Meyrig died in 575 at the age of 90 while Dubricius was born in 475, was consecrated bishop in 505 and died in 560 at the age of 85. In the genealogies in the "Jesus College MS 20" of the fifteenth century, Peibo is called "Peibiawn Glawrawc", and is reckoned to be the son of Arbeth and the father of Tewdwr.