Celtic Myths explores the mythology and beliefs of the pagan Celts between about 600 B.C. and A.D. 400. At their peak, the Celtic peoples inhabited a vast area of Europe, Great Britain, and Ireland. As non-literates, they have left no written record of their lives, their beliefs, and the stories which were such an important part of their culture; however, contemporary commentators from the Classical world, later Christian scribes recording oral traditions, and the archaeological evidence can give us fascinating, though fragmented, glimpses. Dr. Green draws on all these sources to discuss the myths and the religious beliefs and ritual which she believes inform them.

The heroic and magical tales of the Book of Invasions, the Fionn stories, the Ulster Cycle, and the Mabinogi are the subject of the first chapters. These stirring stories, though recorded in medieval times by Christian writers, preserve fascinating evidence of their pagan origins. Dr. Green then goes on to look at the evidence for Celtic religious beliefs and raises some interesting questions as to how far we can establish links and recognize common features between the story material and the archaeological record.