Incubus
INCUBUS (a Late Latin form of the classical incubo, a nightmare, from inctibare, to lie upon, weigh down, brood), the name given in the middle ages to a male demon which was supposed to haunt women in their sleep, and to whose visits the birth of witches and demons was attributed. The female counterparts of these demons were called succubae. The word is also applied generally to an oppressive thing or person.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
