It was written by a former catholic nun who turned liberal. The book was reputedly highly regarded by Muslims due to its moderate tone and historical accuracy. Yet in it I found it unbelievable to see his life stories. One of his wives was a 9 years old when he married her ten years before his death. He also took the wife of one of his relatives who saw his intention and divorced her to allow that to happen. After he moved to Medina from Mecca, he and his people murdered many merchants.