Radulphe (also spelled Radulph, Rodolphe, etc.) was a French monk who, without permission from his superiors, left his monastery in France^[1] and travelled to the Rhine Valley during the Second Crusade (1145–1149) where he preached "that the Jews should be slain as the enemies of the Christian religion."^[2] At Cologne Simon "the Pious" was murdered and mutilated; at Speyer a woman was tortured on the rack to persuade her to Christianity.^{[citation needed]} Secular prelates tried to protect the Jews. Arnold, the Archbishop of Cologne gave them a fortified castle as refuge, and allowed them to arm themselves; the Crusaders refrained from attacking the castle, but killed any unconverted Jew that fell into their clutches.^[1] Henry I, Archbishop of Mainz admitted into his house some Jews pursued by a mob; the mob forced its way in, and killed them before his eyes.^[1]

The Archbishops appealed to Bernard of Clairvaux, the most influential Christian of his time; Bernard replied with a strong denunciation of Radulphe, and demanded an end to violence against the Jews.^[1] When Radulphe continued his campaign Bernard came in person to Germany,^[1] "protested energetically against the unchristian behavior of Radulph"^[2] and forced the monk to return to his monastery.^[1]

Thereafter in 1147 the mutilated body of a Christian was found at Würzburg; Christians charged Jews with the crime, and, despite the protests of Bishop Emicho von Leiningen, attacked them, killing 20 and wounding many more; the Bishop buried the dead in his garden.^[1]

From Germany, Rodolphe's idea of "beginning the Crusades at home" passed back to France, and Jews were massacred at Carentan, Rameru,^[3] and Sully.^[1][4] In Bohemia 150 Jews were murdered by Crusaders. After the terror had passed, the local Christian clergy did what it could to help the surviving Jews; and those who had accepted baptism under duress were allowed to return to Judaism without incurring the dire penalties of apostasy.^[1]