Despite all the killings the first Crusade proceeded across Europe to Constantinople (modern Istanbul) in western-Turkey. But they were delayed by nearly one year when the king of Hungary blocked their path, after he found out they wanted to kill the Jewish population. To him the Jewish community had brought his kingdom wealth and he did not want to loose that. In the second and third Crusades, his kingdom was obliterated by the French and German knights.
When the first Crusade reached Constantinople, they more or less destroyed it. By this period the Byzantine empire was in decline and this was the last chapter for the Christian Eastern Church. Meanwhile all of these events were encouraged by the Maronite Christians in the Middle-east, who switched allegiance from the Byzantines to the Roman Catholics in Rome. Jeremiah 7:26.
Ask me and I will tell you! 