1. 2012
2. Agweddau ar ryddiaith Owen Martell

   Evans, R. L. (Author), Price, A. (Supervisor), 2012

   Student thesis: Doctor of Philosophy

3. 2007
4. Dechreuadau a gweithgarwch cynnar John Jones (Myrddin Fardd)

   Efans, N. (Author), 2007

   Student thesis: Doctor of Philosophy

5. 2006
6. Nofel hanes a rhagymadrodd

   Griffith, G. (Author), Sept 2006

   Student thesis: Doctor of Philosophy

7. Hanes y ddrama ym Mon 1930-1975

   Williams, O. A. (Author), 2006

   Student thesis: Doctor of Philosophy

8. 2004
9. Geirfa Gymraeg Sir Fflint

   Wynne, G. (Author), Thomas, G. (Supervisor), 2004

   Student thesis: Doctor of Philosophy

10. 2001
11. Diwylliant ar waith: astudiaethau gwerin o Gymru

    Gwyndaf, R. (Author), Jarvis, B. (Supervisor) & Thomas, G. (Supervisor), 2001

    Student thesis: Doctor of Philosophy