Celtic lore has long been a staple of history and fantasy, for classical writers as well as for those to follow them. Classical writers such as Ausonius were themselves Celtic, and possibly of Druid background, as were many of the Christian writers, including the Celtic Christian theologian Pelagius, whom Father Fortunatus followed. Hecateus of Miletus and Herodotus of Halicarnassus recorded the existence of the Celts in the fifth and sixth centuries B.C., and Polybius, Pliny, Julius Caesar, and Tacitus all spoke of them, creating an image which has been perpetuated through the centuries of military prowess, magical power, and frequently bloody rites. Historical chronicles, saints' lives, and the sagas of mythic heroes like Conchobar and Cuchulain, along with those of faery, the Tuatha de Danaan, continued this lore. The archaeological record, such as that contained in the Gundestrup Cauldron, a first-century silver bowl such as...