Henry IV of Germany convened the Synod of Worms on 24th January 1076 in order to secure the deposition of Pope Gregory VII. It issued a strongly anti-papal statement and marked the beginning of the Investiture Controversy.
|Brian Tierney, The Crisis of Church and State, 1050-1300. Medieval Academy Reprints for Teaching. University of Toronto Press Inc., 1990. Pbk. ISBN: 0802067018. pp.212. Amazon.com|