Celtic religion Celtic paganism https://en.wikipedia.org/wiki/Ancient_Celtic_religion https://en.wikipedia.org/wiki/Category:Ancient_Celtic_religion https://www.wikidata.org/wiki/Q263031 Ancient Celtic religion The religious beliefs and practices adhered to by the Iron Age people 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.