For this edition, Wilfried Hartmann has extensively revised his standard work on the Investiture Controversy and completely updated the research discussions. In particular, the sections on source editions, biographies, and kingship have been significantly expanded, as research in these areas has made particularly important contributions over the past 15 years. A separate section presents and critically evaluates the literature on the turn of the 11th century. As in previous editions, the comprehensive, thematically organized bibliography complements this fundamental introduction for students and lecturers of Medieval History.