Tywysogaeth Cymru, 1267-1967
Subtitle: astudiaeth mewn hanes cyfansoddiadol
By: gan J. Goronwy Edwards; cyfieithiad gan Gwynn ap Gwilym.
Publisher: Ysgol Astudiaethau Trwy'r Gymraeg
Published: 1991
Place of publication: Bangor
Language: wel
Number of pages: 68
Work titles: The principality of Wales, 1267-1967.