Pope Alexander III And the Council of Tours (1163): A Study of Ecclesiastical Politics and Institutions in the Twelfth Century

From the Preface:

The 1163 council at Tours met amidst the most protracted conflict between a pope and a secular ruler in medieval history, the eighteen—year struggle between Alexander III and Frederick Barbarossa. The gathering duly receives a paragraph or so in surveys of that dispute, and it usually is included—and properly so—in lists of the important sources for twelfth— and thirteenth—century canon law. But the meeting has been accorded no integrated study of all its political and le...