Celtic polytheism, commonly known as Celtic paganism, comprises the religious beliefs and practices adhered to by the Iron Age peoples of Western Europe now known as the Celts, roughly between 500 BCE and 500 CE, spanning the La Tène period and the Roman era, and in the case of the Insular Celts the British and Irish Iron Age. Celtic polytheism was one of a larger group of Iron Age polytheistic religions of the Indo-European family. It comprised a large degree of variation both geographically and chronologically, although "behind this variety, broad structural similarities can be detected" allowing there to be "a basic religious homogeneity" amongst the Celtic peoples. The Celtic pantheon consists of numerous recorded theonyms, both from Greco-Roman ethnography and from epigraphy. Among the most prominent ones are Teutatis, Taranis and Lugus. In the later 5th and the 6th centuries, the Celtic region was Christianized and earlier religious traditions were supplanted.
Related: Folklore, légendes, ésotérisme