The Origin of the Idea of Crusade: Foreword and additional notes by Marshall W. Baldwin

Though conditioned by the specific circumstances of eleventh-century Europe, the launching of the crusdaes presupposed a long historical evolution of the idea of Christian knighthood and holy war. Carl Erdmann developed this argument first in 1935 in a book that is still recognized as basic to an understanding of how the crusades came about. This f