An in-depth study of the remarkable growth of Plaid Cymru as a powerful political force in Wales during the 20th century, based on detailed research and numerous interviews, with a foreword by Gwynfor Evans. 19 black-and-white photographs.

Astudiaeth drylwyr o dwf anhygoel Plaid Cymru fel grym gwleidyddol pwerus yng Nghymru yn ystod yr 20fed ganrif, wedi ei seilio ar ymchwil fanwl a chyfweliadau niferus, gyda rhagair gan Gwynfor Evans. 19 ffotograff du-a-gwyn.