Christian knights waged a religious war against the Muslims in Jerusalem in an attempt to reclaim the Holy Land.
The Fourth Crusade 1202-1204
The second crusade was summoned by the Pope to defeat the Muslims who were still threatening to retake the Holy Lands. The fall of the County of Edessa the previous year marked the need for more military reinforcements.
The Fifth Crusade 1217-1221
The Third Crusade, also known as The Kings' Crusade, was an attempt by European leaders to reconquer the Holy Land from Saladin.
The Sixth Crusade 1228-1229
The Fourth Crusade was a Western European armed expedition called by Pope Innocent III, originally intended to reconquer Muslim-controlled Jerusalem by means of an invasion through Egypt.
The Fifth Crusade was an attempt by Western Europeans to reacquire Jerusalem and the rest of the Holy Land by first conquering the powerful Ayyubid state in Egypt
Frederick II, failed to lead the Fifth Crusade. He felt guilty for the crushing defeat the Christian armies suffered against the Egyptian sultan, so he decided to launch a new crusade paid entirely with the Holy Roman Empire funds to recover Jerusalem.