6 The Crusades and Europe’s Wider Connections
Explore why the Crusades began, how their major campaigns unfolded, and how they affected political power, religious relations, trade, travel, and people across Europe and neighboring regions.
What the were
The were religiously authorized military campaigns launched by western European Christians from the late eleventh century onward. Many focused on capturing or defending Jerusalem and other places in the eastern Mediterranean, but crusading also spread to regions such as Iberia and the Baltic. The campaigns connected Europe with Byzantine, Muslim, and Jewish societies through warfare, diplomacy, trade, and travel, and they brought severe violence and lasting political consequences.
Why the campaigns began
In 1095, Byzantine emperor Alexios I sought western military help against Seljuk Turks, who had taken territory from the Byzantine Empire in Anatolia. At the that year, Pope Urban II called on western Christians to aid eastern Christians and gain control of sacred places, especially Jerusalem. The city had been under Muslim rule for centuries and was sacred to Muslims as well as Christians and Jews.
Religious devotion was central for many participants. The Church presented crusading as an act of penance and offered spiritual benefits to those who took the cross. Other motives also mattered: nobles and knights might seek land, status, wealth, or adventure, while rulers and popes pursued political goals. These aims did not always align, even among the crusaders themselves.
Major campaigns and their outcomes
After several poorly organized groups set out, the main armies traveled east through Byzantine lands. They captured Antioch in 1098 and Jerusalem in 1099, killing many of the city’s inhabitants. They established four : the Kingdom of Jerusalem, the County of Edessa, the Principality of Antioch, and the County of Tripoli.
The campaign’s gains did not endure without challenge. Muslim forces captured Edessa in 1144, prompting the Second Crusade (1147–1149), led in part by Louis VII of France and Conrad III of Germany. It failed to recover Edessa, and an attack on Damascus ended in defeat.
In 1187, defeated the crusader army at Hattin and recaptured Jerusalem. European rulers including Richard I of England and Philip II of France led the Third Crusade (1189–1192). Crusaders regained some coastal territory but not Jerusalem; an agreement allowed Christian pilgrims access to the city.
The (1202–1204) was intended for the eastern Mediterranean but was diverted by financial and political disputes. Crusaders first attacked the Christian city of Zara and then captured and sacked , the Byzantine capital, in 1204. This deepened the divide between western and eastern Christians and gravely weakened the Byzantine Empire.
Later expeditions, including campaigns led by Louis IX of France, failed to restore lasting Christian rule over Jerusalem. In 1291, Mamluk forces captured , the principal remaining crusader stronghold on the Levantine coast. This brought the main there to an end.
Trade, travel, and cultural contact
Italian maritime cities such as Venice, Genoa, and Pisa carried people and supplies across the Mediterranean and gained commercial opportunities. Trade between Mediterranean ports continued even during periods of warfare. Europeans encountered goods, artistic styles, and crafts from Byzantine and Islamic societies, while objects and techniques also moved in the other direction.
These exchanges took place through established trading networks as well as through crusading. The campaigns did not create all contact between the regions, so their effects should not be reduced to a simple story of cultural exchange or European progress.
Political and religious consequences
Organizing expeditions required transport, supplies, and taxes. Some monarchs strengthened their authority by raising money and coordinating military campaigns. At times, the papacy gained influence by calling Christians to a common cause, although repeated failures also damaged papal prestige.
The sack of in 1204 weakened Byzantium and intensified hostility between western Catholic and eastern Orthodox Christians. More broadly, the crusading idea linked religious authority with warfare and political expansion well beyond Jerusalem, including in Iberia and the Baltic.
Human costs and lasting effects
Crusading was associated with massacres, forced displacement, and attacks on civilians. During the , crusaders massacred Jewish communities in parts of the Rhineland. In the eastern Mediterranean, warfare affected Muslims, Christians, and Jews, and the were created and maintained through conquest.
These harms were a fundamental part of the ’ history, not a side effect of cultural contact. The campaigns’ consequences included extensive violence and worsening religious and political divisions, alongside expanded trade and travel and changes in political authority.