Robert of Clari: The Conquest of Constantinople

The Surrender of Constantinople During the IV Crusade, mosaic of 1213, Basilica of San Giovanni Evangelista, Ravenna.

A fascinating eyewitness account of the Fourth Crusade and the infamous siege and sack (A.D. 1204) of Constantinople. Image above links to Google Books entry. ISBN recommendation: 0-231-13669-2.  See also Appendix I, Memory and Reconciliation, for a reflection upon historic grave violations of charity by representatives of the Catholic community.