The holy war is a conflict that is caused by differences between religions, specifically by the presence of extremist religious who believe in a monotheistic dogma (existence of only one God), in order to defend their religious ideologies, as well as the places that they consider as sacred according to their beliefs and at the same time handle said conflicts as a strategy to publish their doctrines of faith, through expansionism through the use of violence. In the first holy wars in history, Islam and Christianity are the protagonists.
Specifically, the holy war of Islamic origin, had its starting point in approximately the year 622, at the time when "Muhammad" emits the direct messages of God, he was threatened with death by the adversaries or enemies of Islam and for this reason he emigrated from “Mecca” to the region called “Medina”, this is a city 300 km north of Mecca, in company with his followers.
Living in the Medina region, Muhammad positioned himself at the head of a new religious community around the year 629; after this, together with an army of ten thousand men, he traveled again to Mecca, which was a city conquered with almost no resistance from the people. After this, specifically around the year 1054, a holy war broke out between Islam and the Catholic Church, because the Catholics wanted to recover the holy sepulcher of Jerusalem, which at that time was in the hands of the Muslims.
During the Middle Ages, the Crusades were primarily military expeditions, organized by the Church in order to recover the Holy Sepulcher in Jerusalem from Muslim rule, and took the form of a true "holy war."
The Catholic Church began to organize military expeditions to order, including to project its influence on the Byzantine territory, dominated by the Orthodox Church, which was the Byzantine church established with the Schism in 1054, and independent from the Pope of Rome.
For almost 200 years, eight expeditions were organized and have provided a great deal of violence against non-Christians. The most successful was the First Crusade, which besieged and conquered Jerusalem and even held various kingdoms in feudal mold, but in the 12th century, the Turks regained the kingdoms, including Jerusalem.
