Antemurale Christianitatis (English: Bulwark of Christendom) was a label used for the country of Croatia for defending the frontiers of Christian Europe from the Ottoman Empire.
In the 15th century Pope Pius II, admiring the Ottoman–Albanian Wars waged mainly by Skanderbeg, defined Albania as Italy's bastion of Christianity (Antemurale Christianitatis Italiaeque). The pope himself declared war on 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, especially the Armenian Kingdom of Cilicia, has been described as the last Christian bulwark in Asia to fall to Muslim rule.
Pope Leo X called Croatia the Antemurale Christianitatis (Predziđe kršćanstva) in 1519 in a letter to the Croatian ban Petar Berislavić, given that Croatian soldiers made significant contributions in war against the Ottoman Empir