Insecure feudal Europe was the battlefield of frequent local conflicts that emerged as a result of the weak central authority, the state of the economy and aspirations of minor noblemen for their own land. The most common occupation was the military one, which among the Church, high nobility and peasantry created existential problems. Faced with that problem, the Church sets up absolute authority which will help create political and spiritual opportunities in Europe. At the same time on the East, the Seljuk Turks are expanding and penetrating from Central Asia and annexing the former areas of Byzantine Empire which Byzantine did not give up easily. Soon, the Seljuks conquer almost the whole Asia Minor. The last resistance against the Turks is provided by the emperor Roman IV Diogenes, who experiences a catastrophic defeat and the very capital of Byzantine Empire, Constantinople, becomes an easy target. In Europe, the Pope Urban II is trying to end the conflicts by means of peaceful movements known as “Peace of God” and “Truce of God” that only partly succeed. During the Council of Piacenza which Urban called himself, the delegates of Byzantine emperor Alexius Komnenos came to plead their western brothers for help in the battle against Seljuk Turks, and under that condition offer religion unity. Prompted by the preceding information about the abuse of Christian pilgrims by the Seljuks, Urban II finds the solution for unifying Europe against their common opponent. He calls all of the great European feudal lords to a “Holy war” and liberation of the Holy Land from the infidels. Pilgrimage, as they called it, did not have such characteristics. The march was marked by conquering many cities such as Nicaea, Edessa, Antioch, Ma’arra and Jerusalem and was thus successful. However, it was followed by the mass bloodshed of Muslims, Jews and Christians that will cause the disorder of religious relations in Mediterranean area and continuing wars in the future.