In response to a denunciation of "blasphemies" in the Talmud by a Jewish convert to Christianity, Nicholas Donin, Pope Gregory IX ordered the archbishops of France, England, Spain and Portugal to seize all Jewish books and examine them. In the letter of June 20 Gregory ordered the churchmen of Paris to burn the confiscated works if they were found to contain "objectionable" content.
Marcus, The Jew in the Medieval World. A Source Book: 315-1791, rev. ed. (1999) 163.