Gwrgan Fawr | Fforest Fawr | Rhinog Fawr | Llyn Arenig Fawr |
The 'altar of St. Teilo" has in the past been associated with the monastery at Llandaff but, as it has been determined that the third, fourth and sixth marginal inscriptions refer to lands within fifteen miles of Llandeilo Fawr, it is now thought that the book originated there.
Dubricius was only active in Ergyng and Gwent, while Teilo's associations with Llandaff have been transferred from his great abbey at Llandeilo Fawr.