The purpose of Cum hiis superioribus annis, a papal bull issued by Pope Callixtus III in 1456, was to exhort Christians to pray, as the success of the Hungarian crusader army against the Turks was key for the future of Christian Europe at the time. To this day, the noon bell tolls every day to remind us that, as so many times in history, the Kingdom of Hungary stood up valiantly and proved itself one of the bulwarks of Christian Europe.