A companion to the Great Western Schism (1378–1417). Edited by Joëlle Rollo-Koster and Thomas M. Izbicki. (Brill's Companions to the Christian Tradition, 17.) Pp. vii+469 incl. 10 figs. Leiden–Boston: Brill, 2009. €152. 978 90 04 16277 8; 1871 6377 - Housley, Norman (The journal of ecclesiastical history, 2011)