Crusade and Christendom : annotated documents in translation from Innocent III to the fall of Acre, 1187-1291 / edited by Jessalynn Bird, Edward Peters, and James M. Powell.

"This book illustrates how the crusade became crucial for defining and promoting the very concept and boundaries of Latin Christendom. It provides translations of and commentaries on key original sources and up-to-date bibliographic materials."--Publisher's description.