Helena Petrovna Blavatsky, born Helena von Hahn on August 12, 1831, in Yekaterinoslav, then part of the Russian Empire, was an influential figure in the spiritualist and occult movements of the late 19th century. A co-founder of the Theosophical Society in 1875 alongside Henry Steel Olcott and William Quan Judge, Blavatsky aimed to promote an understanding of theosophy, an esoteric philosophy that...