Book excerpt: The early medieval manuscripts of Ireland and Britain contain tantalizing clues about the cosmology, religion and mythology of native Celtic cultures, despite censorship and revision by Christian redactors. Focusing on the latest research and translations, the author provides fresh insight into the beliefs and practices of the Iron Age inhabitants of Ireland, Britain and Gaul. Chapters cover creation and cosmogony, the deities of the Gaels, feminine power in narrative sources, druidic belief, priestesses and magical rites.