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druid, ancient religious leaders active in Ireland, Britain, and Gaul during the western European Iron Age. They existed from at least 200 bce and in some areas may have survived to about 400 ce. Although little is known with certainty about the druids, they probably constituted a predominantly or exclusively male priesthood that played an important role in the polytheistic religions of these Celtic-speaking societies. Much of what is known about the druids comes from...