Pope Callixtus III
Pope Callixtus III ordered the bells of every European church to be rung every day at noon, as a call for believers to pray for the defenders of the city. The practice of the noon bell is traditionally attributed to the international commemoration of the victory at Belgrade and to the order of Pope Callixtus III, since in many countries (like England and the Spanish Kingdoms) news of the victory arrived before the order, and the ringing of the church bells at noon was thus transformed into a commemoration of the victory. The Pope didn't withdraw the order, and Catholic and the older Protestant churches still ring the noon bell to this day.