A New History of Ireland is the largest scholarly project in modern Irish history. In 9 volumes, it provides a comprehensive new synthesis of modern scholarship on every aspect of Irish history and prehistory, from the earliest geological and archaeological evidence, through the Middle Ages, down to the present day.

Volume I begins by looking at geography and the physical environment. Chapters follow that examine pre-3000, neolithic, bronze-age and iron-age Ireland and Ireland up to 800. Society, laws, church and politics are all analysed separately as are architecture, literature, manuscripts, language, coins and music. The volume is brought up to 1166 with chapters, amongst others, on the Vikings, Ireland and its neighbours, and opposition to the High-Kings. A final chapter moves further on in time, examining Latin learning and literature in Ireland to 1500.