This extensive work details various periods of Irish history, from the Iron Age through 1704. It contains information on early civilizations, governments, ethnic groups, localities, geographical features, architecture, wars; royal lineages, and church histories and architecture, among other topics. Included are extensive chronologies as well as lists of nobles, clergymen, and government officials, with detailed sections on the major events in Irish history organized by year and, in alternate sections, by county.

Ireland features some of Europe's most significant antiquities, such as its passage tombs, ring forts, castles, Neolithic settlements and monastic sites. This guide explores the mythology and history of the country, as well as including suggestions for the best places to stay, eat and sleep.

The Catholic Diocese of Ossory includes most of County Kilkenny, a portion of Leix, and one parish in Offaly.