A siege by a monarch of this name forced his rival to escape with the help of Robert Guiscard, who sacked that rival's city in the process.
Two years after a monarch of this name crushed a rebellion at the Battle of Langensalza, those rebels installed his half-brother and "anti-king" Rudolf of Rheinfelden during his absence. A siege by a monarch of this name forced his rival to escape with the help of Robert Guiscard, who sacked that rival's city in the process. Shortly after taking issue with the decree Dictatus papae, a monarch with this name was excommunicated and appointed Clement III as anti-pope in revenge. An emperor of this name renounced his right to grant power "by ring and staff" at a meeting with Callixtus II, the Concordat of Worms. Matilda of Tuscany received an emperor of this name who, seeking penance from Pope Gregory VII, walked to Canossa Castle. For 10 points, give this name of the Holy Roman Emperors who started and ended the investiture controversy.
Two years after a monarch of this name crushed a rebellion at the Battle of Langensalza, those rebels installed his half-brother and "anti-king" Rudolf of Rheinfelden during his absence.
Henry [accept Henry IV or Henry V] &lt;European History post-600&gt;