Crusading in Iberia: Papal Privileges and Frontier Warfare

From the late eleventh century, popes increasingly attached crusading privileges to particular campaigns against Muslim-ruled powers in Iberia, the peninsula occupied chiefly by present-day Spain and Portugal. These campaigns took place amid shifting truces, rivalries and alliances, and their participants included Iberian rulers and military orders as well as crusaders from beyond the Pyrenees. Portugal’s territorial expansion reached the Algarve in 1249, while the Emirate of Granada endured until 1492. After its fall, crusading language and papal support also accompanied some Iberian campaigns in North Africa.

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How Iberian warfare acquired crusading privileges

The campaign at Barbastro in 1064, sanctioned by Pope Alexander II, is often treated as a precursor to crusading in Iberia. The connection became clearer around the time of the First Crusade, which began in 1095. Pope Urban II encouraged Christians in Iberia to fight locally rather than leave for the eastern Mediterranean, and extended to those campaigns spiritual privileges comparable to those offered to crusaders in the East. These included indulgences, grants of remission for penance associated with sin.

In 1123, the First Council of the Lateran under Pope Callixtus II formally treated warfare against Muslims in Iberia as part of the crusading movement. This papal recognition mattered because it gave a religious framework to campaigns that could also serve the political and material aims of kings and nobles.

Frontier politics beyond religious allegiance

The political landscape shifted as well. After the Caliphate of Córdoba broke apart in 1031, a number of smaller Muslim states, known as taifas, competed with one another. Christian rulers sometimes demanded parias, payments made by Muslim rulers in return for protection or to avert attack. Such arrangements could bring revenue without requiring an immediate conquest. Christian rulers also fought one another, while Muslim and Christian powers sometimes formed alliances against common rivals.

North African dynasties, including the Almoravids and later the Almohads, intervened in Iberia and changed the balance of power. Their involvement did not end the variety of local relationships. A ruler might make a treaty with one neighbour and fight another; truces and tribute existed alongside raids and sieges. Christian mercenaries could serve Muslim rulers, and Christian authorities could use crusading privileges in disputes with other Christians. In 1197, for example, Pope Celestine III granted a crusading bull to Sancho I of Portugal for a proposed campaign against Alfonso IX of León, who had cooperated with the Almohads. The operation did not come to battle.

Crusaders from abroad and the siege of Lisbon

The fall of Edessa in 1144 helped prompt the Second Crusade. In 1147, Pope Eugenius III also authorized crusading in Iberia. A fleet of crusaders from northern Europe, including English, Flemish, German and other contingents, was travelling toward the Holy Land when bad weather brought it to Porto. King Afonso I of Portugal, who had been seeking support for a campaign against Lisbon, negotiated with the newcomers. They agreed to join him in exchange for the right to take spoils and ransom money from the city.

The siege lasted from 1 July to 25 October 1147. Portuguese forces and the visiting crusaders worked together, though they had separate leaders and did not always agree. They attacked the city’s defences and built siege engines; meanwhile, fighting and shortages weakened the defenders. Lisbon’s rulers eventually agreed to surrender. The terms promised the garrison and inhabitants their lives and property, but some crusaders broke the agreement and looted the city. The episode shows how religious commitment could coexist with expectations of material reward, and how difficult it could be for a ruler to control a large, multinational force.

Lisbon became a major centre of the Portuguese kingdom, and some crusaders settled there. Others continued east or took part in further campaigns in Iberia. In the same period, papal support also helped draw Genoese and Pisan naval forces to the campaign at Almería, and crusaders joined the conquest of Tortosa in 1148. These were distinct operations, not parts of a single centrally commanded expedition.

Military orders and the campaign of Las Navas de Tolosa

During the twelfth century, military orders became an important part of Iberian warfare. These were religious communities whose members also fought and helped hold frontier strongholds. Iberian orders such as Santiago, Calatrava and Alcántara developed alongside the Templars and Hospitallers. Their organized forces and castle garrisons gave rulers a resource for sustained campaigning and defence. They were not independent of the politics around them: they served within wider royal and regional strategies.

The best-known crusading campaign of the early thirteenth century was the expedition that culminated at Las Navas de Tolosa on 16 July 1212. After Castile’s defeat at Alarcos in 1195 and the Almohad capture of Salvatierra Castle in 1211, Alfonso VIII of Castile sought papal backing for a major campaign. Pope Innocent III called for a crusade, and Alfonso secured the participation of Peter II of Aragon and Sancho VII of Navarre. Military orders, town forces and volunteers from across Europe also joined the campaign. The pope’s support helped encourage the Christian rulers to cooperate despite their rivalries.

Many of the crusaders from beyond the Pyrenees left before the battle. Accounts differ on their reasons, citing the summer heat and supply difficulties as well as disagreements over the treatment of defeated Muslims. The remaining coalition defeated the Almohad army, but the victory did not immediately end Almohad power or bring the conquest of southern Iberia. Its military consequences were limited at first; the major Christian advances into the Guadalquivir valley came decades later. Portugal’s campaigns had their own course, reaching the Algarve in 1249, while the Crown of Aragon expanded into Valencia and the Balearic Islands.

Granada and the shift to campaigns across the Strait

By the thirteenth century, Granada was the last Muslim-ruled state in Iberia. It survived in part through tribute and truces with Castile, while the frontier remained a place of raids and negotiation. In the late fifteenth century, the balance changed. Castile and Aragon were more closely aligned under Isabella of Castile and Ferdinand of Aragon, while conflict within Granada weakened its rulers. The Granada War, fought from 1482 to 1492, consisted of seasonal campaigns rather than ten years of uninterrupted warfare.

The war was chiefly a royal project led and resourced by Castile, with a smaller role for Aragon. Crusading authorization and church contributions helped fund the campaign, but the fighting was not organized like the international expedition that had gathered at Lisbon in 1147. Castilian forces increasingly relied on artillery to reduce fortified towns and cities. On 2 January 1492, Granada surrendered, ending Muslim political rule on the peninsula. Muslim communities remained, however, and the terms initially granted at surrender did not prevent later pressure to convert or leave.

The end of Muslim rule in Iberia did not end crusading activity by Iberian powers. Portuguese expansion into North Africa had already begun with the capture of Ceuta in 1415. After Granada fell, the Catholic Monarchs’ campaigns across the Strait also drew on crusading language and, in some cases, papal bulls and crusade-related donations. The focus had shifted from conquering Muslim-ruled territories within Iberia to campaigns beyond it; this was a change of arena, not the continuation of a single medieval war.

The later meaning of the Reconquista

Medieval writers did not describe the centuries of Iberian warfare as a unified process called the Reconquista. The term took shape in later historiography and was consolidated in nineteenth-century Spain, when it became associated with national histories that presented the past as a continuous Christian recovery of territory. Modern accounts emphasize the many phases and regional differences, including periods of peace, tribute and cross-religious alliance. Keeping this later idea distinct from medieval crusading makes clear that papal privileges shaped particular campaigns, not every conflict between Iberian Christian and Muslim powers.