Helena Petrovna Blavatsky, born Helena von Hahn on August 12, 1831, in Yekaterinoslav, then part of the Russian Empire, was a controversial figure who left an indelible mark on the study of esoteric and mystical traditions. She is best known for co-founding the Theosophical Society in 1875, along with Colonel Henry Steel Olcott and William Quan Judge. Blavatsky's life was characterized by an unque...