The Blackburn Cult, officially the Divine Order of the Royal Arms of the Great Eleven, or the Great Eleven Club, was a new religious movement started in 1922 by American woman May Otis Blackburn. She started the group on Bunker Hill in Downtown Los Angeles, California, and later formed a retreat in the Southern California Simi Valley. Blackburn was said to have received revelations directly from angels, and, along with her daughter Ruth Wieland Rizzio, believed that she was charged by the archangel Gabriel to write books revealing the mysteries of Heaven and Earth, and life and death.