Helena Blavatsky

Helena Petrovna Blavatsky (née Hahn von Rottenstern; 12 August [O.S. 31 July] 1831 – 8 May 1891), often known as Madame Blavatsky, was a Russian and American mystic and writer who co-founded the Theosophical Society in 1875. She gained an international following as the primary founder of Theosophy as a belief system.
Born into an aristocratic family in Yekaterinoslav, Blavatsky traveled widely around the empire as a child. Largely self-educated, she developed an interest in Western esotericism during her teenage years. According to her later claims, in 1849 she embarked on a series of world travels, visiting Europe, the Americas, and India. She also claimed that during this period she encountered a group of spiritual adepts, the "Masters of the Ancient Wisdom", who sent her to Shigatse, Tibet, where they trained her to develop a deeper understanding of the synthesis of religion, philosophy, and science.
Both contemporary critics and later biographers have argued that some or all of these foreign visits were fictitious, and that she spent this period in Europe. By the early 1870s, Blavatsky was involved in the Spiritualist movement. But while defending the genuine existence of Spiritualist phenomena, she argued against the mainstream Spiritualist idea that the entities contacted were the spirits of the dead. Relocating to the United States in 1873, she befriended Henry Steel Olcott. She rose to public attention as a spirit medium and drew accusations that she was a charlatan.