Key Takeaways Helena Petrovna Blavatsky, born August 12, 1831, in Yekaterinoslav and died May 8, 1891, founded the Theosophical Society in New York City in 1875 alongside Henry Steel Olcott and William Q. Judge. Her key works, Isis Unveiled from 1877 and The Secret Doctrine from 1888, built a framework of ‘Ancient Wisdom’ that influenced […]