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Who founded the Theosophical Society in New York City in 1875?

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The Theosophical Society was founded in New York City in 1875 by Helena Petrovna Blavatsky, Henry Steel Olcott, and William Quan Judge, along with several other prominent individuals.123

Blavatsky, a Russian spiritualist, and Olcott, an American attorney and student of spiritualism, were the primary figures behind the organization's establishment to promote theosophy, a philosophical-religious system that incorporates elements of Eastern and Western thought. Following the society's founding, Olcott served as its president, and the organization eventually moved its international headquarters to Adyar, near Madras, India.123