The Crusades won Jerusalem after losing many of their troops through hardships. They sacked Constantinople and savaged a spree of loot. Temporarily, they strengthened papal influence with successful battles to take back towns. However, later crusades declined the papal prestige since they were not able to detain the Byzantines. The Crusades were never able to successfully accomplish their mission of taking back the Holy Land but brought many long-term effects that would modify the empire.
The crusaders weakened the feudal nobility since they lost many of their lands to go on expeditions. The Byzantine power also decreased with the powerful attacks from the Crusades. Religious intolerance erupted with the Muslims, Jews, and Christians. These religions used each other as scapegoats and attacked each other with hostility. The Crusades brought an increase in trade to the empire since they purchased new utensils and foods from Arab markets that benefited them. In the long run, Crusades sparked changes that would important to the future of the empires economy and people.