W.Y. Evans-Wentz - The Fairy-Faith in Celtic Countries - The Supreme God
Type of Spiritual Experience
A description of the experience
The Fairy-Faith in Celtic Countries, by W.Y. Evans-Wentz, 
Canon Mahé puts the matter thus:--'The Celts recognized a supreme God, the principle of all things; but they rendered religious worship to the genii or secondary deities who, according to them, united themselves to different objects in nature and made them divine by such union. Among the objects were rivers, the sea, lakes and fountains.'