Monasticon Hibernicum is a searchable database of Irish ecclesiastical sites. Based on the work of antiquarian Mervyn Archdall (1723-1791) the website was launched in 2003 and is updated. It includes over 5,000 sites from the 5th to 12th centuries. An article in Monastic Research Bulletin by one of the compilers, Ailbhe Shamhráin, discusses the project. The sources used for the project are outlined – primary sources, chronicles, hagiographical works, as well as archaeological sources, place name studies, and folk traditions. The data structure is outlined, especially the geographical arrangements: administrative districts of townland, civil parish, barony and county; and the ecclesiastical divisions of parish, deanery and diocese. Finally some observations gleaned from the data are given with a brief case study of Becc Ériu, Wexford.
