Since the 6th century, Christians frequently made pilgrimages to the birthplace of their religion. Until...
Until the turks took the city, threatened to invade Byzantine Empire and take Constantinople!
The Byzantine Emperor Alexius I made a special appeal to Pope Urban II for help.
Pope Urban II, after convening the largest religious summit in Catholic history, makes a call to arms to take back the Holy Land from the invading Muslims.
Excitement mounts as the start of the first crusade draws closer, but many are also unprepared. With there lack of supplies and no fighting experience, many people embarked expecting to die. Between 1096-1099 a group over 30-50 thousand people fighting for the church.
The Crusade's forces break through the Muslim defense and take back Jerusalem, slaughtering all the inhabitant of the city to purge the unclean.
The first Crusade is widely considered the most successful of all them. They retook the Holy land, drove out the Muslims, and obtained many riches of the Catholic church.
After the later crusades failed, many people lost interest in supporting the crusades, and decided to invest in other expeditions such as finding commercial routes to the east without going through the muslim controlled territories.