13th-century stained glass image of Frederick I, Strasbourg Cathedral. By © Ralph Hammann – Wikimedia Commons – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=14571718

At Strasbourg, Frederick imposed a small tax on the Jews of Germany to fund the Third Crusade. He also put the Jews under his protection and forbade anyone to preach against the Jews.[81] When mobs threatened the Jews of Mainz on the eve of the assembly in March, Frederick sent the imperial marshal Henry of Kalden to disperse them. Rabbi Moses then met with the emperor, which resulted in an imperial edict threatening maiming or death for anyone who maimed or killed a Jew. On 29 March, Frederick and the rabbi rode through the streets together. Frederick successfully prevented a repeat of the massacres that had accompanied the First Crusade and Second Crusade in Germany.