The setting

Between 1095 and 1492, Christian attitudes towards Muslims changed through prolonged contact as well as conflict. Muslim-ruled states remained in the Iberian Peninsula. Sicily also had a substantial Muslim population under Norman and, later, Christian rulers. Warfare continued, but so did trade, diplomacy and intellectual exchange.

Hostility was never universal or constant. Political circumstances, clerical leadership and local relationships all affected its intensity.

The Crusades

At Clermont in 1095, Pope Urban II presented armed pilgrimage as a defence of eastern Christians and as a way to recover Jerusalem. When the First Crusade captured Jerusalem in 1099, crusading warfare gained enormous religious prestige. Later crusades reinforced the image of Muslims as enemies against whom Christian violence could earn spiritual reward.

Preachers, chroniclers and reports of warfare often presented the diverse Muslim world as one religious opponent. This language reached beyond the eastern Mediterranean. Popes also granted crusading privileges for campaigns in Iberia and other contested regions.

Crusading did not rule out negotiation. Christian and Muslim rulers made truces, exchanged prisoners and sometimes joined forces against rivals from their own religion. Even so, the Crusades gave political wars a powerful religious framework that could be used to understand and justify them.

Fear of Muslim power

Hostility also grew out of fears about a genuine military threat. Muslim dynasties controlled wealthy territories and important Mediterranean routes. In Iberia, the Almoravids and then the Almohads intervened from North Africa, temporarily strengthening resistance to Christian expansion.

From the 14th century, Ottoman victories in the Balkans increased fear elsewhere in Europe. Many western Christians saw the Ottoman victory at Kosovo in 1389 and the conquest of Constantinople in 1453 as evidence of advancing Muslim power. These fears encouraged calls for renewed crusades, even though European rulers remained divided.

Christian doctrine and teaching

Medieval Latin Christianity claimed exclusive possession of religious truth. Christian writers commonly described Islam as false teaching, a corruption of revelation or a challenge to the proper religious order. Sermons and polemical texts spread hostile portrayals of Muslim belief and of the Prophet Muhammad.

Church leaders could link warfare against Muslims with penance and salvation. This gave religious authority to campaigns that also served dynastic or economic purposes. For many people, preaching, legends and memories of conflict shaped their understanding more than accurate knowledge of Islam did.

Religious teaching did not lead to one fixed response. Some clergy encouraged conversion or debate. Rulers governing Muslim subjects, however, often accepted practical coexistence. Historians therefore place different weight on the causes of hostility. Some put crusading ideology at the centre, while others emphasise political insecurity and the way rulers used religious language to mobilize support.

Political setting

At the beginning of this period, Iberia was divided among Christian kingdoms in the north and Muslim-ruled territories conventionally called al-Andalus. Neither side formed a permanent united bloc. Castile, León, Aragon, Navarre and Portugal pursued their own interests, while Muslim territory passed through Almoravid, Almohad and smaller regional rule.

The balance shifted sharply after the Christian victory at Las Navas de Tolosa in 1212 weakened Almohad authority. Córdoba fell to Castile in 1236 and Seville in 1248. Thereafter the Nasrid kingdom of Granada remained the principal Muslim state in Iberia until its surrender in 1492.

Religious motivations

Christian rulers and clergy presented territorial expansion as the recovery of land for Christianity. Papal support and crusading privileges linked Iberian campaigns to the wider crusading movement. Victories permitted the establishment or restoration of bishoprics, the conversion of mosques into churches and the extension of Christian government.

Religion helped rulers recruit warriors and legitimize conquest. Military orders such as Santiago and Calatrava defended frontier zones and combined warfare with a religious vocation. The final campaign against Granada, conducted by Ferdinand of Aragon and Isabella of Castile, was similarly represented as a Christian enterprise.

Religious motivation should not be mistaken for uninterrupted religious unity. Christian rulers fought each other, while Christian and Muslim states concluded alliances and paid one another for military assistance when this served immediate political needs.

Economic motivations

Conquest promised land, revenue and political advancement. Monarchs could grant estates to nobles, military orders, churches and settlers, thereby rewarding service and securing newly acquired territory. Control of productive farmland, towns, ports and trade routes strengthened royal income.

Tribute was another incentive. Christian rulers extracted payments from weaker Muslim states, while frontier warfare offered booty and captives. Granada's wealth, agricultural resources and access to Mediterranean commerce made it valuable even before its final conquest.

Economic historians emphasize the material interests of monarchs, nobles and settlers. Other interpretations give greater weight to religious conviction and the prestige of sacred warfare. The two motives usually reinforced one another: religion legitimized expansion, while the rewards of expansion helped sustain it.

Warfare in Iberia

Christian–Muslim conflict produced a shifting frontier, not one continuous war. Raids, sieges, tribute agreements and periods of truce were common. Major turning points included Las Navas de Tolosa in 1212, the Castilian capture of Córdoba in 1236 and Seville in 1248, and the surrender of Granada in 1492.

Conquest redrew the political map. Christian kingdoms absorbed most Muslim-ruled territory, while many Muslims remained as subjects under Christian government. These communities could keep aspects of their religion and law through negotiated arrangements, but their position relied on rulers honouring the terms of conquest.

Mediterranean and Balkan frontiers

The conflict reached beyond Spain. Mediterranean warfare centred on competition for islands, ports and commercial routes. Sicily shows both coexistence and its collapse: its Muslim population initially remained economically and culturally important under Norman rule, but later revolts, repression and forced resettlement sharply reduced that community.

In the Balkans, Ottoman expansion created another frontier between Christian-ruled and Muslim-ruled states. The Ottoman victory at Kosovo in 1389 and the conquest of Constantinople in 1453 changed the regional balance of power. Diplomacy and trade continued alongside warfare, and Balkan rulers sometimes cooperated with the Ottomans against Christian rivals.

Economic disruption

Raiding and prolonged campaigns damaged farms, settlements and local markets. In insecure frontier regions, populations fled or were displaced, which reduced production and tax income. Conquering rulers also redistributed land and property, replacing older elites with new military, ecclesiastical or settler communities.

The economic result was not simple collapse. Conquered cities could recover under new rulers, while Mediterranean trade continued across religious boundaries during political conflict. The clearest losses came where warfare, forced movement and discrimination removed established cultivators, artisans and merchants faster than new ones could replace them.

Declining cultural and intellectual diversity

Medieval Iberia and Sicily brought Christians, Muslims and Jews into contact. That contact encouraged translation, scholarship, commerce and the movement of scientific and philosophical knowledge. Coexistence remained unequal and periodically violent, but it still opened opportunities for exchange.

As Muslim political power contracted, Arabic-speaking communities and institutions lost protection and influence. Conquest, migration and pressure to convert narrowed the cultural range of some regions. Christian scholars continued to appropriate and translate Arabic learning, so intellectual exchange survived even as the communities that had sustained it weakened.

Growth of anti-Muslim feeling

Repeated warfare made religious identity an increasingly important political boundary. Crusading preaching and victory celebrations portrayed Muslims as collective enemies. Fear of internal disloyalty could also be directed at Muslim subjects living under Christian rule.

By 1492, the conquest of Granada had strengthened an ideal of Christian religious unity in Spain. Historians still dispute whether growing intolerance was the inevitable outcome of medieval conflict. One interpretation stresses long-term crusading hostility; another highlights the later concentration of royal power and the political use of religious conformity.

Jewish communities in medieval Europe

Jewish communities lived across Iberia, France, England, the German lands, Italy and the Mediterranean. Their legal position differed greatly from one place to another. Rulers might grant them protection and privileges, but that dependence also left them exposed if protection was withdrawn or rulers chose to exploit hostility towards them.

Jews worked in many occupations, though local restrictions sometimes limited their options. Their economic role went well beyond moneylending. Jewish communities took part in commerce, medicine, scholarship, crafts and government service.

Finance

Some Jewish financiers lent money to rulers, nobles, monasteries, towns and individuals. Christian restrictions on lending at interest created opportunities, although Christians also provided credit. Jewish lenders could draw on family and communal networks to transfer money and judge risk.

Aaron of Lincoln, active in 12th-century England, became a major creditor. His clients included members of the nobility and religious houses. His career shows both the importance and the insecurity of Jewish finance: royal government benefited from Jewish lending, taxed its profits and took control of outstanding debts after his death.

The link between Jews and debt also fuelled resentment. Debtors might support anti-Jewish measures for material reasons. Monarchs, meanwhile, could cancel or seize debts to secure political and financial advantages.

Trade

Jewish merchants linked local markets to wider regional networks. Religious and family connections could help them communicate across political frontiers. Knowledge of languages also supported trade between Christian- and Muslim-ruled lands.

They moved textiles, metals, agricultural goods and luxury products. Jewish involvement varied from place to place, but Jewish merchants helped connect Iberia, northern Europe and the Mediterranean through commercial networks.

Scholarship

Jewish scholars worked in philosophy, medicine, astronomy, biblical interpretation and linguistic study. Many operated in multilingual settings where Hebrew, Arabic and Latin learning came together.

Abraham ibn Ezra travelled through Christian Europe in the 12th century and transmitted knowledge of Hebrew scholarship, mathematics and astronomy. Moses Maimonides, born in Córdoba in 1138, wrote major works on Jewish law, philosophy and medicine after leaving Iberia. His writings circulated among Jewish readers and, through translation and debate, influenced Christian intellectual life as well.

Jewish translators contributed to some translation projects in medieval Iberia. Their knowledge of Arabic and Romance languages helped make works preserved or developed in Arabic available to scholars who read Latin.

Royal bureaucracy

Rulers employed some Jews as physicians, tax officials, diplomats, translators and financial administrators. This service could bring influence and protection. It also gave monarchs access to literacy, linguistic skills and commercial connections.

Judah ben Moses al-Cohen served the 13th-century Castilian court of Alfonso X and contributed to its translation and scientific projects. Isaac Abravanel later worked for Ferdinand and Isabella in financial administration before the expulsion of 1492.

Royal service offered no lasting security. Court officials depended on the ruler's favour and could become targets of resentment because people associated them with taxation or royal power. Historians therefore see Jewish prominence in government as evidence of integration, but also as a source of dangerous dependence.

Religious hysteria during the Crusades

Crusading sometimes redirected religious violence towards Jewish communities within Europe. In 1096, groups linked to the First Crusade attacked Jewish communities in Rhineland towns including Speyer, Worms and Mainz. Local bishops sometimes tried to protect them, but massacres, forced conversions and suicides followed.

As they prepared to fight Muslims abroad, the attackers treated nearby Jews as enemies of Christianity. Crusading preaching did not always call for attacks on Jews, and church authorities sometimes condemned the violence. Even so, the intense religious emotion, armed mobilization and weakened local order that surrounded crusades made persecution more likely.

Later crusading movements brought further violence. The massacre at York in 1190, during preparations for the Third Crusade, also involved debt, local rivalry and the failure of royal protection. Religious enthusiasm worked alongside material and political motives.

Official and popular anti-Semitism

Anti-Semitism in the guide's wording refers here to hostility and discrimination directed against Jews as Jews. In medieval Europe, it commonly took a religious form, though social and economic resentments also played a part.

Christian teaching blamed Jews collectively for the death of Christ and portrayed Judaism as religious error. Popular accusations included the false claim that Jews murdered Christian children for ritual purposes. The case associated with William of Norwich in 1144 helped spread this blood-libel story, despite the absence of reliable evidence.

Official policy could convert prejudice into legal discrimination. The Fourth Lateran Council of 1215 required Jews and Muslims in Christian lands to be distinguishable by their clothing. Secular rulers imposed special taxes, limited occupations or restricted residence. Enforcement varied. The same authorities might protect Jewish communities because they valued their financial and administrative services.

Scapegoating

Scapegoating means blaming a vulnerable group for a wider crisis or problem, regardless of evidence. Jews were especially exposed because they were a recognizable religious minority whose security depended heavily on rulers.

Economic grievances helped drive this process. Debtors could present Jewish creditors as responsible for their hardship, while rulers and nobles could gain by confiscating Jewish property or cancelling obligations. Religious difference turned disputes involving particular individuals into accusations against entire communities.

The Black Death

The Black Death reached Europe in 1347 and caused catastrophic mortality during 1348–1351. Since people did not accurately understand infection, rumours accused Jews of poisoning wells and deliberately spreading disease. The accusation was false: Jewish communities suffered from the plague as well.

Torture produced supposed confessions, which were then used to justify further violence. In 1349, Strasbourg's Jewish community was massacred even though the city's authorities had found no sound evidence of a Jewish plot. Similar attacks took place across parts of the German lands and Switzerland.

Historians disagree about the relative weight of belief and self-interest. Religious fear and ignorance made the accusations credible to many contemporaries. At the same time, attackers and political leaders could gain from confiscated property, cancelled debts and the removal of commercial competitors.

Massacres

Persecution repeatedly led to mass killing. The Rhineland massacres of 1096 destroyed or badly damaged major Jewish communities. More attacks followed at York in 1190 and during the Black Death, including the Strasbourg massacre of 1349.

The effects reached well beyond the deaths themselves. Survivors experienced bereavement, forced conversion, loss of property and displacement. Jewish chronicles and religious practice preserved memories of martyrdom, keeping persecution within communal identity.

Expulsion

Rulers expelled Jews as a group when political, financial or religious circumstances made removal useful. Edward I expelled the Jews from England in 1290. The French monarchy ordered major expulsions in 1306 and 1394. Earlier expulsions had sometimes been followed by readmission when rulers once again needed Jewish revenue and credit.

In Spain, Ferdinand and Isabella issued the Alhambra Decree in 1492. Jews had to accept baptism or leave their territories. Families were forced to sell property quickly, and many refugees moved to Portugal, North Africa, Italy or the Ottoman world. The order also covered territories linked to the Spanish monarchy, including Sicily.

Expulsion strengthened royal claims to Christian unity, but it also involved confiscation, debt and control of property. Its effects were therefore religious, political and economic.

Segregation from society

Segregation appeared in legal, social and physical forms. Requirements for distinctive clothing marked Jews publicly as outsiders. Restrictions on officeholding and, in some places, on guild membership, landholding and residence limited equal contact with Christians.

Some Jewish quarters grew up around synagogues and communal institutions through choice and convenience. Increasingly, though, coercive measures turned separation into a sign of inferior legal status. With fewer chances for ordinary social contact, Christians and Jews were more likely to rely on stereotypes. Officials could also monitor and tax a concentrated community more easily.

Economic losses

Removing or destroying Jewish communities could mean losing financiers, merchants, physicians, artisans and administrators. Credit networks might be disrupted, commercial links weakened and royal governments deprived of experienced officials and taxpayers.

The effects varied. Christian and foreign financiers could replace Jewish lenders, and rulers sometimes gained immediate profits from confiscated property. The longer-term loss came from the destruction of established networks, specialist knowledge and trust, which could not always be rebuilt quickly.

Intellectual and cultural losses

Persecution could weaken some centres of Hebrew learning and limit exchange between Jewish, Christian and Muslim scholars. Expelled scholars took manuscripts, languages and intellectual traditions to new homes. These enriched the regions that received them while diminishing the places from which they had been driven.

There was a cultural loss as well. Towns and kingdoms became less diverse when Jewish religious practice, literature and communal memory disappeared from public life. One interpretation stresses the damage to economic and intellectual development. Another argues that medieval economies adapted and that the most important consequence was human: the destruction of communities and the denial of security on the basis of religion.