For whom the bell tolls at noon

I haven't submitted any new pic for a while, but now here's my new one, that I made for the 555th anniversary of the Battle of Belgrade (the capital of Serbia, which was called Nándorfehérvár that time), which ended on 22 July 1456.
The picture is a portrait of János Hunyadi, the main general of the Hungarian forces in the battle.

About its history: After having occupied Constantinople in 1453 and most of the Balkanic region up to 1456, the Ottoman empire was planning to capture quickly the city of Belgrade, whereby it could be possible to get into the inner territories of the Kingdom of Hungary and organise later sieges against Vienna and Western Europe. Because of that, it was clear if the city falls, so falls Europe. The main powers of that time, such as France, England and Spain were all weakened because of several conflicts (just think about the Hundred years war), so they were unable to send additional forces to the city. Only an army of peasants and yeomans led by a Franciscan friar called Giovanni da Capistrano could arrive to the aid of the defenders of the city. The defence of Belgrade was led by an experienced general, János Hunyadi (who was also the Regent Governor of the Kingdom of Hungary between 1446 and 1453) and his brother-in-law Mihály Szilágyi and his eldest son László.
With the aid of Capistrano's army, the local Serbs and other European crusaders and mercenaries (mainly Polish, Germans and Czechs), the Hungarians could manage to build a force of 25-30,000 men. However, it was still outnumbered against the army of approximately 70,000 men, 28 cannons and 200 galleys of the Ottomans led by Mehmed II.
Before the siege started, Pope Callixtus III ordered every christian churches of Europe to ring the bell every day at noon for calling the believers to pray for the defenders of the city.
The first Ottoman attack against the city was on July 4, and others had followed by time. Altough the heavy losses on both sides and the ruined city walls, the Ottomans couldn't capture the castle of Belgrade after all. According to a legend, a (probably fictional)Hungarian Knight called Titusz Dugovics grabbed an Ottomans soldier, who tried to plant the Sultan's flag on top of a bastion, and together fell from the wall to the ground.
Although the significant victory of the Christian forces, plague broke out in the city. Both János Hunyadi and Giovanni da Capistrano died because of the illness.

The victory at Belgrade stopped the Ottomans from further invasions against Hungary for the following 70 years, mainly thanks to János Hunyadi's son, king Matthias Corvin (raigned from 1457 to 1490), who had made a peace treaty with the Ottomans and which was renewed several times.