By the time of the second and later crusades, it had become almost a routine: ???At the beginning of the agitation for a new crusade many Jews of Mayence, Worms, Spires, Strasbourg, W??rzburg and other cities, escaped to neighbouring castles, leaving their books and precious possessions in the custody of friendly burghers.???[192] One of the main sources is the Book of Remembrance by Ephraim bar J