Die Päpstin Johanna. Biographie einer Legende. By Max Kerner and Klaus Herbers. Pp. 176 incl. 52 ills+8 colour plates. Cologne: Böhlau, 2010. €19.90. 978 3 412 20469 3 - Osten-Sacken, Vera van der (The journal of ecclesiastical history, 2011)