Madame Blavatsky, born in 1831 in Ukraine, was a prominent figure in the spiritual movement known as Theosophy. She co-founded the Theosophical Society in 1875, which aimed to promote universal brotherhood and explore the mysteries of existence through a blend of science, religion, and philosophy. Blavatsky is best known for her influential writings, including "Isis Unveiled" and "The Secret Doctrine." These works introduced concepts such as karma and reincarnation to Western audiences, drawing from various religious traditions, including Hinduism and Buddhism. Her ideas have had a lasting impact on modern spirituality and esoteric thought.