When the Turks were invading Europe in the wake of the fall of Constantinople, they laid siege to Belgrade, then a border fort of the kingdom of Hungary. John preached a crusade against them and took part in the battle on 22 July 1456 in which John Hunyadi, his army and John’s peasant crusaders lifted the siege and defeated the Turks, keeping Christian Europe safe from Turkish invasion for the next 70 years. Plague spread through the camp and John died of it, at Ilok, in what is now Croatia, on 23 October 1456. He is the patron saint of military chaplains. Credit: Universalis.com. For more about this saint, please click on the image. Peace be with you!