The Chronicle of Ireland reports that in the mid-sixth century Fr ech n mac Tenus n cast the "druidical fence" over the army of High King D armait mac Cerbaill at the battle of Cul Dreimne, and that D armait lost that battle due to "the prayers of Colum Cille" (Saint Columba). But how could there have been a practicing Druid in the King of Tara's court in the Age of the Saints, a century after Saint Patrick brought Christianity to Ireland?