Antemurale Christianitatis was a label used for a country defending the frontiers of Christian Europe from the Ottoman Empire.
Albania
In the 15th centuryPope Pius II, admiring Ottoman–Albanian Wars, waged mainly by Skanderbeg defined Albania as Italy's bastion of Christianity. The pope himself declared the war to the Ottoman Empire in 1463, but such war was never fought, as the following year he died at Ancona, while still organizing the naval attack on the Ottomans.
Armenia
Armenia, especially the Armenian Kingdom of Cilicia, has been described as the last Christian bulwark in Asia to fall to Muslim rule.
called Croatia the Antemurale Christianitatis in 1519 in a letter to the Croatian banPetar Berislavić, given that Croatian soldiers made significant contributions in war against the Ottoman Empire. The advancement of the Ottoman Empire in Europe was stopped in 1593 on Croatian soil, which could be in this sense regarded as a historical gate of European civilization. Nevertheless, the Muslim Ottoman Empire occupied part of Croatia from the 15th to the 19th centuries.. However, Pope Leo X wasn't the first that gave Croatia such a title. The nobility of the southern Croatian regions sent a letter to Pope Alexander VI and Roman-German emperor Maximilian I on April 10, 1494 seeking help against the Ottoman attacks. In that letter Croatia was for the first time called bastion and a bulwark of Christianity:
In the nearly 400-year-long war against the Ottoman Empire, many Croatian warriors and heroes became known for their merits. Some of them were:
Marko Skoblić, Defender of Zemun who was tied and thrown under an elephant because he refused to convert to Islam and to become loyal to the Ottoman Empire
Petar Berislavić, Croatian ban who received a blessed sword and a hat from the Pope Leo X in 1513 as a gift for the great victory in the Battle of Dubica
Nikola Jurišić, Croatian nobleman who stopped 140,000 Suleiman's troops which were going to conquer Vienna
Croatian BanNikola IV Zrinski who saved Pest with only 400 Croatian soldiers and in 1566 in the Siege of Szigetvár with 2.500 Croatian soldiers stopped Suleiman I's army with over 100,000 soldiers in their attempt to conquer Vienna and all of Europe
For its centuries-long stance against the Muslim advances, the Polish–Lithuanian Commonwealth also gained the name of Antemurale Christianitatis. In 1683 the Battle of Vienna marked a turning point in a 250-year-old struggle between the forces of Christian Europe and the Islamic Ottoman Empire. Wespazjan Kochowski in his Psalmodia polska tells of the special role of Poland in the world and the superiority of the Polish political system.