From the eighth century of our era, and even before (some facts so prove it) the coexistence between religions that better identify to the West (Christianity) and the Middle East (musulmanismo) lived hours of growing enmity. The unstoppable advance of Islam, and the gradual divergence and intolerance, had led both to an open ideological war and expansion. After the triumph in the year 1071 of the Seljuks in Syria and Palestine, and the subsequent capture of Jerusalem, the alleged threat of so-called infidels was almost a step of joining Europe. Alejo Comneno, Emperor of Byzantium, had spread his voice of alert in the Western world. And Pope Urban II, at the famous Council of Clermont, was in its aid by organizing the first crusade (1096-1099) under the motto: Deus vult! (God wants it!).

However, the papal initiative was not the first attempt to fight against Islam. In 1095, a French cleric named Peter the hermit, or Pedro de Amiens, had Egged to the faithful to take up arms and recover the Holy places with a disastrous pilgrimage of 12,000 men (composed of peasants, artisans and noblemen medium) which was massacred by the Seljuk Sultanate of Rum forces. Precisely this new and great Empire was the cause and trigger of crossover pop. Let’s see: After the well known break the legendary Roman Empire thanks to the expansive force of the Germanic migrations, one of its two divisions, the Byzantine, had taken over the part East of Europe. Weak, sensual, corrupt and without character to be installed firmly in the zone, very soon became threatened by their own dissension and the challenge of the Croats, Norman (who had already seized the South of Italy) and above all, the Seljuk Turks, a people of Turkish origin of a quality military and Warrior as or more advanced than their peers in the West.