One of the reasons which are occasionally cited for Urban’s calling of the First Crusade is the call of help which Alexins Comnenus had sent to Urban at the Council of Piacenza. This letter was sent in response to the loss of Byzantine land which had occurred after the battle of Manzikert in 1072. The letter When Urban received this letter it is debateable as to whether he was actually galvanised by the thought of helping Alexins or if his main motive was an attempt at ending the schism between the Catholic Church and the Greek Orthodox church in Constantinople. This is likely as it was one of the ideals of the papal reform movement which Urban belonged to, following in the footsteps of his predecessor, Gregory VII. By making out to help the Byzantine emperor in their time of need, Urban hoped to heal the schism.
Another reason behind why Urban called for a Crusade is for religious purposes. He felt Christians in the East needed to be rescued from persecution and had ‘suffered mightily at the hands of the Turks’ and there men and children were being persecuted and there women raped , this was also backed up in Alexins letter to the Pope. Christians were supposedly suffering under Muslim rule after the Byzantine Empire was defeated by the Seljuk Turks who reverted to Islam, at the point when