Celtic Polytheism and Comparative Mythology

Celtic polytheism encompassed a loosely related family of religious traditions practiced across a wide swath of Iron Age and early historic Europe, from Ireland and Britain to Gaul and parts of central Europe, unified less by a single fixed pantheon than by broadly shared structures of ritual, sacred landscape, and priestly authority. The Druids, described by Roman authors including Julius Caesar in his Commentarii de Bello Gallico and the elder Pliny in his Natural History, functioned among the Gauls and Britons as a learned class combining religious, judicial, and educational roles, reportedly undergoing training that could last up to twenty years and relying on oral transmission of their teachings. Caesar’s account describes Druidic involvement in animal and, more controversially, human sacrifice, claims that must be treated cautiously given that Roman writers had clear political motives for portraying Celtic religion as barbaric, particularly following Rome’s conquest of Gaul and, later, Claudius’s suppression of Druidism in Britain during the first century CE. Because the Celts left no substantial contemporary written record of their own religious beliefs, modern understanding depends heavily on this outsider testimony, later medieval literature, and archaeology.