The Theosophical Society is the organizational body of Theosophy, an esoteric new religious movement. It was founded in New York City, U.S.A. in 1875. Among its founders were Helena Blavatsky, a Russian mystic and the principal thinker of the Theosophy movement, and Henry Steel Olcott, the society's first president. It draws upon a wide array of influences among them older European philosophies and movements such as Neoplatonism and occultism, as well as parts of eastern religious traditions such as Hinduism and Buddhism.
https://en.wikipedia.org/wiki/Theosophical_Society