Muratori mentions the two sieges of Ancona; the first, in 1167, against Frederic I. in person (Annali, tom. x. p. 39, etc.;) the second, in 1173, against his lieutenant Christian, archbishop of Mentz, a man unworthy of his name and office, (p. 76, etc.) It is of the second siege that we possess an original narrative, which he has published in his great collection, (tom. vi. p. 921 - 946.)