The early medieval manuscripts of Ireland and Britain have preserved tantalizing clues pertaining to the cosmology, religion and mythology of native Celtic cultures. In this unique collection of new studies and translations, ancient source materials and research from the fields of archaeology, linguistics and comparative religion illuminate the depths of these indigenous beliefs and practices. The book focuses on three themes—Cosmology, Sovereignty and Liminality—and explores sacred origins, three cosmic realms, four directions and the World Tree, seasonal cycles, religious practitioners, goddess figures, and the acquisition of poetic inspiration and Otherworld wisdom. An excellent resource for students of Celtic mythology and religion, Irish, Scottish and Welsh folklore, comparative religion, world mythology, Goddess studies, and those interested in their Celtic heritage.