The second Crusade was launched when Muslims stole land from the Christians. This Crusade failed because of poor planning.
The third Crusade formed when the Muslims stole back Jerusalem. King Richard fought the crusade and won, keeping Jerusalem.
The fourth Crusade was in 1201. Knights conquered Zara and Costinpole to gather money to sail to the Holy Land.
Crusaders learned about trade and goods such as apricots, rice, and cotton cloth. They also learned Muslim ideas.
Kings gained power because of the deaths of nobles and knights. They gained more land because landowners died in the Crusades. Rulers and nobles took control over the Pope, earning themselves even more power.
Christians, Jews, and Muslims still have a lasting distrust because of all the fighting in the Crusades.