“Helena Petrovna Blavatsky: (called Mme Blavatsky, 1831-1891) Russian-born spiritualist, medium, magician, and occultist. Blavatsky founded the Theosophical Society. She wrote Isis Unveiled (1877) and The Secret Doctrine (1888), influential books of occult lore. She toured India, Europe, and the U.S., developing and preaching her doctrines. The poet William Butler Yeats was profoundly influenced by her work.”
Excerpted from: Murphy, Bruce, ed. Benet’s Reader’s Encyclopedia, Fourth Edition. New York: Harper Collins, 1996.