Madam Blavatsky founded the Theosophical Society. She was a prominent Russian occultist, author, and philosopher who played a significant role in the establishment and development of the society.

The Theosophical Society:
The Theosophical Society was founded in New York City on November 17, 1875. Its primary objective was to promote universal brotherhood and encourage the study of comparative religion, philosophy, and science. The society aimed to explore the unexplained mysteries of life and the universe, seeking to bridge the gap between science and spirituality.

Madam Blavatsky's Role:
- Helena Petrovna Blavatsky, commonly known as Madam Blavatsky, was the driving force behind the creation of the Theosophical Society.
- She was a highly influential figure in the spiritual and occult movements of the 19th century.
- Blavatsky claimed to have received esoteric knowledge from hidden masters who possessed profound wisdom.
- Her writings and teachings formed the foundation of the Theosophical Society's ideologies and beliefs.
- Blavatsky's most notable work, "The Secret Doctrine," outlined her cosmological and metaphysical theories, exploring the nature of reality, karma, reincarnation, and the spiritual evolution of humanity.
- She aimed to revive ancient wisdom and unite various spiritual traditions under a common understanding.

Theosophical Society's Impact:
- The Theosophical Society quickly gained popularity and expanded globally, establishing branches in numerous countries.
- It attracted members from diverse backgrounds, including intellectuals, artists, scientists, and spiritual seekers.
- The society's teachings influenced many prominent figures of the time, such as Annie Besant, who became a key leader and president of the society after Blavatsky's death.
- The Theosophical Society's emphasis on spiritual growth, ethics, and the interconnectedness of all beings resonated with many individuals seeking a deeper understanding of life's mysteries.
- It played a significant role in promoting Eastern philosophies and spiritual practices in the West and contributed to the development of the New Age movement.

In conclusion, Madam Blavatsky was the founder of the Theosophical Society. Her teachings and writings provided the foundation for the society's beliefs, which aimed to bridge the gap between science and spirituality while promoting universal brotherhood and the exploration of the mysteries of life.