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Theosophy was Leadbeater's main religious interest. Theosophy is a syncretic religious movement that combines elements from various Eastern and Western spiritual traditions. It was founded in the late 19th century by Helena Blavatsky and Henry Steel Olcott. Theosophy emphasizes the importance of spiritual development and the existence of a divine spark within each person. Leadbeater was a prominent member of Theosophical Society and wrote extensively on theosophical topics.