Reasons for the crusades?

The term crusades refers to a number of wars faught between the Christians and the Muslims during the middle ages. the main reason for the crusades was over who would control the city of Jerusalem. Jerusalem had significance meaning to both religions. other reasons for crusades are about territory and also the True Cross. the true cross was believed to be from the actual cross that Jesus was crucified on. it was in the Muslim's posession and the christians desperately wanted it.
Pope Urban II (1088-1099, was responsible for assisting Emperor Alexus I (1081-1118) of Constantinople in launching the first crusade. He made one of the most influential speeches in the Middle Ages, calling on Christian princes in Europe to go on a crusade to rescue the Holy Land from the Turks. In the speech given at the Council of Clermont in France, on November 27, 1095, he combined the ideas of making a pilgrimage to the Holy Land with that of waging a holy war.
The crusaders were against everyone who did not follow their religion and did not look like them. This included Muslims, Jews, and even dark-skinned Christians, all of whom were attacked and murdered by them. They even sacked the city of Constantinople, which was ruled by the Eastern Church (the Byzantine Church).