Known at the Thuatha de Danaan in Ireland, they lived in shelters burrowed under mounds and hills. As more aggressive races migrated into their territories, these secretive little people retreated into the forests. However, some possibly maintained a guerilla warfare against the newcomers, giving rise to the legends of Rob Roy and Robin Hood. Faeries are nature spirits. Faeries were believed to be some of the spirits which populate all places and objects on Earth.
Faeries are fallen angels.
In the lore of Scandinavia, Scotland, and Ireland, when God cast Lucifer and his angels from heaven, God raised His hand and stopped them in mid-fall. These angels were condemned to remain where they were, becoming the faeries of seas and rivers, the earth, and the air. Faeries are the souls of dead pagans. Since the pagans are unbaptized, they are neither considered good enough to go to heaven nor bad enough to go to hell. Faeries are the children of Adam and Lilith.