What C was a military expedition to regain Jerusalem the Holy Land of the Christian?

The military expedition to regain Jerusalem, the Holy Land of Christianity, is known as the Crusades. The most notable of these was the First Crusade, which began in 1096 and successfully captured Jerusalem in 1099. The Crusades were driven by religious fervor, as well as political and economic motives, and they marked a significant period of conflict between Christians and Muslims in the medieval era.