You had Crusades against Germanic non-Christians in Northern Europe. You had Crusades in Spain in order to retake land from the Muslims, which they had for several hundred years, what's known as the Reconquista. So after Aleppo and Edessa were taken, you have the Second Crusades, which end up being quite unsuccessful, and it really doesn't change what the Middle East looks like. But then as you get to the end of the 12th century, you have a significant event. In 1187, you have the Sultan Saladin, often known as Saladin, being able to retake Jerusalem and much of the Holy Land. Remember, this is after roughly 90 years of rule of Jerusalem by the Western Europeans, by these crusader kingdoms. So this really strikes a chord with the West, and so they decide to launch what will be known as the Third Crusade.