This multi-volume project seeks to provide a definitive, comprehensive, and scholarly account of Irish history from prehistoric times to the modern era. Edited by Art Cosgrove and other prominent historians, the work aggregates contributions from a wide range of national and international scholars. It utilizes a multidisciplinary framework, incorporating archaeology, linguistics, law, and literature to construct a holistic view of the Irish experience. The text serves as a primary reference for understanding the evolution of the island's political, social, and cultural structures.

Experts and historians widely regard this series as the foundational reference work for the study of Irish history. Readers frequently note the academic density of the prose, which is intended for serious researchers and students of the field.