The LL states:
Noe ab Arthur … gave … ,in the first place, Penn Alun, with its territory, without any payment to mortal man, besides to God, and to Archbishop Dubricius, and the church of Llandaff … and also Llandeilo fawr, on the banks of the Towy, with its two territories, where Teilo, the pupil and disciple of St. Dubricius dwelt; and likewise the territory of the Aquilensians, on the banks of the river Tâf. Noe placed his hands on the four Gospels, and committed to the hand of Archbishop Dubricius this alms forever …
… the lands of the Church of Llandaff, namely, Penaly, and Llandeilo fawr, and Llandyfrgwyr, which had before belonged to Archbishop Dubricius, and from the time of Noe son of Arthur …
Baring-Gould and Fisher noted:
The grant of Llanddowror, with Penally and Llandeilo Fawr, to Dubricius by Nouy or Noë ab Arthur1 is clearly a forgery, as the latter lived at a much later period. Noë was the father of Sannan, the mother of Elisse, King of Powys circa 725-750, to whose memory the Valle Crucis pillar was set up.
Bartrum, referring to the above authors wrote:
Noe filius Arthur occurs in the Book of Llandaf as the donor of land in Penalun [Penally] in Dyfed (BLD 77), but the charter is clearly a forgery (LBS II.401), pretending that the original recipient of the land was Dubricius.
Although Bartrum did not accept the above genealogy cited by Baring-Gould and Fisher, see Sanan ferch Elise, he dated Nowy to c. 580 and came to the same conclusion concerning the authenticity of the charter. The reality is that this entry was not a forgery. Nowy ab Arthur belonged to gen. 1, see Why Bartrum’s dating of the Demetian Arthur is wrong, as did Dubricius as can be seen in the table below.
||JC 10 seg. 1
|13||Morgan Hen||Morgan Hen|
|8||Gwriad||Gwriad or Ceingar|
|1||Tewdrig||St. Dyfrig (Dubricius)|
Morgan Hen died in the year 974 and Dubricius in the year 612. In Culhwch ac Olwen the brothers Nynnio and Peibio appear transformed into oxen.
 Rees, W. J., 1840, 321
 Ibid., 374
 Baring-Gould, S., Fisher, J., 1908, 401
 Bartrum, P. C., 2009, 579