"As its title reveals, the novel is based on the life of one of the most fascinating, extraordinary women in Western history--Pope Joan, a controversial figure of historical record who, disguised as a man, rose to rule Christianity in the 9th century as the first and only woman to sit on the throne of St. Peter. Brilliant and talented, young Joan rebels against the medieval social strictures forbidding women to learn to read and write. When her older brother is killed during a Viking attack, Joan takes up his cloak and identity, goes to the monastery of Fulda, and is...