A significant body of scholarship addresses pre-Norman Irish life and history, including the archaeology, art, and architecture from the time of St. Patrick (d. 493) to the arrival of the Normans in the twelfth century. While the place of the church and its organization in pre-Norman Ireland have been extensively studied, relatively little has been published on the eucharistic liturgy as celebrated in the pre-Norman church or on the attitudes of its worshippers to the Eucharist. But, as Neil Xavier O’Donoghue notes, many of Ireland’s national treasures—including the Ardagh Chalice,...