Investiture Controversy
In 1116, the Speyer Bishop Bruno of Saarbrücken (1107–1123) sided with the princes who opposed Henry V in the Investiture Controversy under the leadership of Archbishop Adalbert I of Mainz. The city of Speyer remaining loyal to Henry V chased the bishop out of town. This was the first recorded political action of the Speyer citizenry. As imperial chancellor of Henry V the bishop negotiated the Concordat of Worms with pope Calixtus II in 1122, ending the Investiture Controversy.