Few Welsh scholars in the modern era have served their profession, university and country as admirably as Sir Glanmor Williams, who died, aged eighty four, on 24 February 2005. By dint of intellectual brilliance, far-sighted vision and exceptional personal charm, he achieved great eminence in the field of Welsh historical studies. It is no exaggeration to claim that the flourishing condition of Welsh history during the last half century is in large measure attributable to his influence. This book seeks to draw out the religious, political, economic, social and educational threads in his work within a local, county, national and British context. It also examines his methodology in the context of the work of other historians within Wales and beyond.