It is only as prehistoric archaeology has come to throw more and more light on the early civilisations of Celtic lands that it has become possible to interpret Celtic religion from a thoroughly modern viewpoint. The author cordially acknowledges his indebtedness to numerous writers on this subject, but his researches into some portions of the field especially have suggested to him the possibility of giving a new presentation to certain facts and groups of facts, which the existing evidence disclosed. It is to be hoped that a new interest in the religion of the Celts may thereby be aroused.