| Title | Notes of researches into the history of the Griffith family of Penrhyn, Llandygai, the results of which were published principally in the articles on the family and that of Williams of Cochwillan in the Dictionary of Welsh Biography. The notes also include material accumulated by one of Glyn Roberts's research students, the late John Rowland Jones, as a basis for his M.A. thesis on 'The development of the Penrhyn Estate to 1431.' |