Greed and lack of knowledge mostly caused the First Crusade. The riches of the East lured many, mostly because younger sons in families lacked economic opportunity. During this time, the church was very corrupted and had split into an eastern and a western organization. To solve this problem, Urban II looked for something that would join all Christians and that is on e of the reasons why he started the First Crusade. Many people returning from the Holy Land were bringing home stories of the violence being committed by the Turks there. Because this was their Holy Land, it caused many Christians to be outraged.
The crusaders existence was established mostly on strong beliefs more than any other reason. The crusaders also brought back the tradition of pilgrimage back to the Holy Land. They consisted of two roles: pilgrims and soldiers. The idea of armed pilgrims weren 't accepted, but in this case they were because they were fighting for the Christian Holy Land. This made "war" justified in their eyes. There are numerous possible reasons for the cause of the First Crusade. But only a few are supported by evidence. There are three possible motives