HAG, HAGGE
Celtic Folklore
Teutonic Folklore
A supernatural being taking the form of a crone. The spirit may be benevolent but is more often of malicious intent. Hags abound in Celtic and Teutonic folklore, and the term is often applied to the queens of the SIDHE and CORN SPIRITS such as Scottish CAILLEAC. They are said to build islands, cromlechs, and other topographical features. The activities of these SPIRITS are often associated with the weather, harvests, and spinning. A hag may also be a SUCCUBUS. Plaguing a sleeper, especially during the Celtic feasts of Beltane and Samhain. In this respect, the term HAGGE is the sixteenth-century English name for the nightmare.
Source: Spirits, Fairies, Leprechauns, and Goblins Encyclopedia