Generations of St. Louisans and countless classes of St. Louis University graduates have heard tall tales about the exorcism performed by SLU Jesuit priests in 1949. The diary of the lead priest, Father Raymond Bishop, would go on to inspire the cult classic horror film “The Exorcist” and novels depicting people possessed by demons. St. Louis University archivist and assistant professor Caitlan Stamm separates fact from fiction and addresses the myths that continue to swirl around SLU’s involvement in the exorcism of “Robbie Mannheim” in 1949.