Christian dualist heresies in the Byzantine world c. 650–c. 1450. Translated and annotated by Janet Hamilton and Bernard Hamilton, with Yuri Stoyanov. (Manchester Medieval Sources.) Pp. xvii+327 incl. 2 maps. Manchester: Manchester University Press, 1998. £45 (cloth), £16.99 (paper). 0 7190 4764 1; 0 7190 4765 X