A number of marvels were attributed to him. After his death a cult towards him developed. He was buried in the first church of the fathers, which stood outside the walls of Strasburg. At the general chapter held there in 1260, now that the Order's new temple of prayer had been completed within the city, his relies were translated thither. Walter von Geroldseck, bishop of Strasburg, presided at the ceremony, and the city turned out for the occasion.
Evidently Bela IV, king of Hungary, and his wife, Queen Mary, heard that this translation of the venerable Friar Preacher's relies was to take place at the time of the chapter. Out of gratitude for favors received through intercession to him, they both wrote letters to the assembled fathers, attesting these and other similar extraordinary occurrences with which they were acquainted, as well as the great veneration in which John was held throughout their country. Humbert of Romans, his successor as Master General, had the two royal documents incorporated in the Lives of the Brethren (Vitae Fratrum), that they might be preserved for posterity.(