Letters to Fr Aubrey Gwynn SJ from Dr. Gearóid MacNiocaill concerning their mutual academic interests. Includes: - references to MacNiocaill’s proposed thesis on the history of the Cistercians in Ireland;

• the reproduction of documents of the Citeaux Abbey preserved in Dijon;
• Abbot Stephen of Lexington and copy of a note by MacNiocaill on the placename ‘Aranea’ (the site of a Cistercian Abbey in County Down) to be published in the 'Bulletin of the Ulster Place-Name Society' (1955, 3pp) and
• list of dates attributed to Irish Cistercian houses (11 June 1957, 2 items).