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The Crusades were a series of religiously sanctioned military campaigns waged by much of Western Christian Europe, particularly the Franks of France and the Holy Roman Empire. The specific crusades to restore Christian control of the Holy Land were fought over a period of nearly 200 years, between 1095 and 1291. Other campaigns in Spain and Eastern Europe continued into the 15th century. The Crusades were fought mainly by Roman Catholic forces (taking place after the East-West Schism and mostly before the Protestant Reformation) against Muslims who had occupied the near east since the time of the Rashidun Caliphate, although campaigns were also waged against pagan Slavs, pagan Balts, Jews, Russian and Greek Orthodox Christians, Mongols, Cathars, Hussites, Waldensians, Old Prussians, and political enemies of the various popes.[page needed] Orthodox Christians also took part in fighting against Islamic forces in some Crusades. Crusaders took vows and were granted penance for past sins, often called an indulgence.[page needed][page needed]
The Crusades originally had the goal of recapturing Jerusalem and the Holy Land from Muslim rule and were launched in response to a call from the Christian Byzantine Empire for help against the expansion of the Muslim Seljuk Turks into Anatolia. The term is also used to describe contemporaneous and subsequent campaigns conducted through to the 16th century in territories outside the Levant usually against pagans, heretics, and peoples under the ban of excommunication for a mixture of religious, economic, and political reasons. Rivalries among both Christian and Muslim powers led also to alliances between religious factions against their opponents, such as the Christian alliance with the Sultanate of Rum during the Fifth Crusade.
The Crusades had far-reaching political, economic, and social impacts, some of which have lasted into contemporary times. Because of internal conflicts among Christian kingdoms and political powers, some of the crusade expeditions were diverted from their original aim, such as the Fourth Crusade, which resulted in the sack of Christian Constantinople and the partition of the Byzantine Empire between Venice and the Crusaders. The Sixth Crusade was the first crusade to set sail without the official blessing of the Pope. The Seventh, Eighth and Ninth Crusades resulted in Mamluk and Hafsid victories, as the Ninth Crusade marked the end of the Crusades in the Middle East.
The Holy Land is significant in Christianity because of the land's association as the place of nativity, ministry, crucifixion and resurrection of Jesus of Nazareth, whom Christians regard as the Saviour or Messiah. By the end of the 4th century, following the Roman Emperor Constantine's conversion to Christianity (313) and later the founding of the Byzantine Empire after the partition of the Roman Empire, the Holy Land had become a predominantly Christian region. Churches commemorating various events in the life of Jesus had been erected at key sites.
Jerusalem in particular holds a significance in Islam as the site of the ascension into heaven of the prophet Muhammad whom Muslims believe to be the foremost prophet of God and Jerusalem is often regarded as the third most sacred site in Islam. The Muslim presence in the Holy Land began with the initial Muslim conquest of Syria in the 7th century under the Rashidun Caliphs. The Muslim armies' successes put increasing pressure on the Eastern Orthodox Byzantine Empire which had originally claimed the region (part of the Eastern Roman Empire which the Byzantines inherited) as their territory – this included eventual incursions by the Seljuk Turks. Jerusalem also holds historical and religious importance for Jews as it is the site of the Western Wall the last remaining piece of the Second Temple. Jews consider Israel as their ancestral homeland, and had been visiting the city since its sack by the Romans and abandonment by the Hebrews after the Hebrew revolt of AD 66–73.
Another factor that contributed to the change in Western attitudes towards the East came in the year 1009, when the Fatimid Caliph al-Hakim bi-Amr Allah ordered the destruction of the Church of the Holy Sepulchre. In 1039 his successor, after requiring large sums be paid for the right, permitted the Byzantine Empire to rebuild it. Pilgrimages were allowed to the Holy Lands before and after the Sepulchre was rebuilt, but for a time pilgrims were captured and some of the clergy were killed.[citation needed] The Muslims eventually realized that much of the wealth of Jerusalem came from the pilgrims; for this reason and others, the persecution of pilgrims eventually stopped. However, the damage was already done, and the violence of the Seljuk Turks became part of the concern that spread support for the Crusades across the Christian world.
The origins of the Crusades lie in developments in Western Europe earlier in the Middle Ages, as well as the deteriorating situation of the Byzantine Empire in the east caused by a new wave of Turkish Muslim attacks. The breakdown of the Carolingian Empire in the late 9th century, combined with the relative stabilization of local European borders after the Christianization of the Vikings, Slavs, and Magyars, had produced a large class of armed warriors whose energies were misplaced fighting one another and terrorizing the local populace. The Church tried to stem this violence with the Peace and Truce of God movements, which was somewhat successful, but trained warriors always sought an outlet for their skills, and opportunities for territorial expansion were becoming less attractive for large segments of the nobility. One exception was the Reconquista in Spain and Portugal, which at times occupied Iberian knights and some mercenaries from elsewhere in Europe in the fight against the Islamic Moors.[citation needed]