A succubus (: succubi) is a demon or supernatural entity in folklore, in female form, that appears in dreams to seduce men, usually through sexual activity. According to religious tradition, a succubus needs semen to survive; repeated sexual activity with a succubus will result in a bond being formed between the succubus and the man; and a succubus cannot drain or harm the man with whom she is having intercourse. In modern representations, a succubus is often depicted as a beautiful seductress or enchantress, rather than as demonic or frightening. The male counterpart to the succubus is the incubus.
The term derives from Late Latin succuba "paramour" from succubare "to lie beneath" (sub- "under" and cubare "to lie"), used to describe this being's implied sexual position relative to the sleeper's position. The English word "succubus" dates from the late 14th century. The succubus is also known as the earth wanderer.
As depicted in the Jewish mystical treatise Zohar and the medieval Jewish satirical text Alphabet of Ben Sira, Lilith was Adam's first wife, who later became a succubus. She left Adam and refused to return to the Garden of Eden after she mated with the archangel Samael. In Zoharistic Kabbalah, there were four succubi who mated with the archangel Samael. The four original queens of the demons were Lilith, Eisheth Zenunim, Agrat bat Mahlat, and Naamah. A succubus may take a form of a beautiful young girl, but closer inspection may reveal deformities of her body, such as bird-like claws or serpentine tails. Folklore also describes the act of cunnilingus on their vulvas, which drip with urine and other fluids. In later folklore, a succubus took the form of a siren.
Throughout history, priests and rabbis, including Hanina ben Dosa and Abaye, tried to curb the power of succubi over humans. However, not all succubi were malevolent. According to Walter Map in the satire De nugis curialium (Trifles of Courtiers), Pope Sylvester II (999–1003) was allegedly involved with a succubus named Meridiana, who helped him achieve his high rank in the Catholic Church.