He attempted to suppress the revolt of the Lombard League twice; the second time, the head of the Guelphs, Henry the Lion, refused to assist him.
This man declared his support for the Antipope Victor IV at the Synod of Pavia after he was excommunicated. His defeat at Battle of Legnano and the ensuing Treaty of Venice was a result of Pope Alexander III refusing to acknowledge this man's supremacy, and his fifth Italian expedition ended in the Peace of Constance. He attempted to suppress the revolt of the Lombard League twice; the second time, the head of the Guelphs, Henry the Lion, refused to assist him. He took up the Cross at Mainz Cathedral and marched against Saladin, but died attempting to swim his horse across the River Saleph. For 10 points, name this Hohenstaufen Holy Roman Emperor, a redbeard.
This man declared his support for the Antipope Victor IV at the Synod of Pavia after he was excommunicated.
Frederick I or Frederick {Barbarossa}