Helena Petrovna Blavatsky, 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.