original_query: What actions did Frankfurt and various German princes take to defend the Jews?
query: What actions did Frankfurt and various German princes take to defend the Jews after the confiscation of Jewish books ordered by Maximilian I?
answer: The archbishop of Mainz, the city council of Frankfurt, and various German princes intervened to defend the Jews after Maximilian I, influenced by Kunigunde and Johannes Pfefferkorn, ordered the confiscation of Jewish books.