Chapter III. The Papacy from the Death of Gregory VII. To the Concordat of Worms. A.D. 1085-1122
Chapter IV
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THE PAPACY FROM THE CONCORDAT OF WORMS TO INNOCENT III. A.D. 1122-1198.
On the historical sources for this period down to the middle of the thirteenth century, see Wattenbach: Deutschlands Geschichtsquellen im Mittelalter, II. 217-442.
Philip Schaff and David S. Schaff, History of the Christian Church, Volume 5: The Middle Ages, AD 1049–1294 (1907). Public domain. Text from the Christian Classics Ethereal Library.