The Element Encyclopedia of Witchcraft: The Complete A-Z for the Entire Magical World - Judika Illes 2005
Cailleach Bolus is one of Cailleach Bhéara’s two sisters. She is associated with ancient standing stones, stone rings, menhirs, and dolmens. She manifests as an aged woman with a swollen belly and sometimes has antlers on her head.
See also Cailleach Bhéara, Cailleach Corca Duibhne; HORNED ONE.