Milo Sweteman, the former archbishop of Armagh, has an ecclesiastical registry that dates back to the medieval era and is around 650 years old.

Experts from the Public Records Office of Northern Ireland (PRONI) are repairing its fragile pages as part of a project to revitalise and conserve some of the most significant historical documents on the island of Ireland.

A research alliance called the Virtual Record Treasury of Ireland is attempting to develop a digital treasure trove that will allow individuals worldwide to access records that have been kept in climate-controlled specialist storage vaults because of their fragility.

In the all-island effort to increase access to seven centuries of history, PRONI is a key collaborator. Copies or drafts of documents produced by the archbishops' administrative activities, such as wills, official letters, legal documents, receipts, and communications, are kept in ecclesiastical registers.

Archbishop Sweteman's registry reflects his tenure as senior ecclesiastical officer from 1361 until 1380. The 1418–1438 Register of Archbishop John Swayne has previously undergone conservation treatment, and a digital copy and a translated synopsis are currently accessible online.

Swayne's first-hand recollections of his time working as a legal expert at the Papal Curia in Rome, where he observed the Council of Constance, a meeting of clerical leaders that ended the nearly century-long Great Schism within the Catholic Church, are included in the register, a composite volume of four books.

In addition to contemplations on global affairs, the documents contain a wealth of more banal insights on Armagh life, such as the archbishop's great distaste for women donning pointy hats, a style of the time that he called "women's horns."