This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Helena Petrovna Blavatsky was a Russian noblewoman and traveller who, with Henry Steel Olcott and William Quan Judge, founded the Theosophical Society in New York City on November 17, 1875, an institution that would go on to shape Western esoteric religion for well over a century after her own death. She presented her teaching as the transmission of an ancient wisdom tradition underlying all the world's religions, received through contact with hidden spiritual adepts she called Mahatmas or Masters, a claim of direct spiritual authority rather than of original philosophical invention.
She set that teaching out chiefly in two large works, Isis Unveiled in 1877 and The Secret Doctrine in 1888, both published over a decade after the Society's founding, meaning her most substantial written statements of doctrine developed alongside the institution rather than preceding and simply founding it. Her writing drew heavily and selectively on Hindu and Buddhist ideas filtered through a Western esoteric and evolutionary framework distinctly her own rather than a faithful transmission of either tradition on its own terms.
She remained the Theosophical Society's central intellectual figure until her death in London in 1891, and its account of hidden spiritual authority became the direct root of the later Ascended Master teachings and much of the wider New Age movement that followed decades after she died.