have free use of its possessions and the lands of those in rebellion should be restored.

Those decrees were communicated to Calixtus II, who despatched the legate Lambert to assist at the synod that had been convoked at Worms, where, on 23 September 1122, the agreement known as the Concordat of Worms was concluded. On his side, the Emperor abandoned his claim to investiture with ring and crosier and granted freedom of election to episcopal sees. On the