Battle of Las Navas de Tolosa in the context of "Ibn Hud"

The Iberian Crusades were papally promoted wars, part of the Reconquista, fought against the Muslim states of the Iberian Peninsula within the wider Crusading movement from 1095 to 1492. The Muslim conquest of the peninsula was completed in the early 8th century, when the Christian Visigothic Kingdom fell, yet the small realm of Asturias endured in the north-west. From the 9th century, its southward expansion against al-Andalus (Muslim Spain) was portrayed in local chronicles as a divinely sanctioned war of recovery. This expansion, along with Frankish advance, gave rise to new Christian realms—Navarre, León, Aragon, Castile, Portugal, and Barcelona—in the north. After al-Andalus split into taifas (small states) in 1031, the Christian realms exploited Muslim disunity to further expansion. From the 1060s, the papacy occasionally supported campaigns against al-Andalus by granting spiritual rewards to participants.

As the Reconquista advanced, the taifa rulers sought aid from the fundamentalist Almoravids of North Africa, who halted the Christian expansion. Soon after proclaiming the First Crusade for the liberation of the Holy Land at the Council of Clermont in 1095, Pope Urban II extended the same spiritual privilege—remission of sins—to Iberian lords who took up arms against the Moors (Iberian Muslims). Peter I of Aragon was the first ruler, in 1100, to fulfil his crusading vow within the peninsula, and his example was soon followed by others. Leading crusading armies, Alfonso I of Aragon captured Zaragoza (1118), Afonso I of Portugal seized Lisbon (1147), and Ramon Berenguer IV of Barcelona took Tortosa (1148). The renewed Christian advance provoked another North African intervention, this time by the Almohads, who could only temporarily halt the Christian expansion. Occasionally, the Moors' Christian allies, such as Alfonso IX of León were also targeted by crusading campaigns. After crusader forces inflicted a decisive defeat on the Almohads at the Battle of Las Navas de Tolosa in 1212, the Reconquista gained new momentum. Papal grants of crusade indulgence then supported James I of Aragon in the conquest of Mallorca (1231) and Valencia (1238), and Ferdinand III of Castile in the capture of Córdoba (1236) and Seville (1248), reducing al-Andalus to the Emirate of Granada by 1262.

Ferdinand III (Spanish: Fernando; 1199/1201 – 30 May 1252), called the Saint (el Santo), was King of Castile from 1217 and King of León from 1230 as well as King of Galicia from 1231. He was the son of Alfonso IX of León and Berengaria of Castile. Through his second marriage he was also Count of Aumale. Ferdinand III was one of the most successful kings of Castile, securing not only the permanent union of the crowns of Castile and León, but also masterminding the most expansive southward territorial expansion campaign yet in the Guadalquivir Valley, in which Islamic rule was in disarray in the wake of the defeat of the Almohad caliphate at the Battle of Las Navas de Tolosa. His repeated and decisive victories against the Islamic Caliphate earned him the title Athleta Christi, meaning 'Champion of Christ', which was conferred upon him by Pope Gregory IX.

By military and diplomatic efforts, Ferdinand greatly expanded the dominions of Castile by annexing the crown of Guadalquivir river valley in the south of the Iberian Peninsula, establishing the boundaries of the Castilian state for the next two centuries. New territories included important cities such as Baeza, Úbeda, Jaén, Córdoba and Seville, that were subject of Repartimiento, given a new general charter and repopulated in the following years.

New Castile (Spanish: Castilla la Nueva [kasˈtiʎa la ˈnweβa]) is a historic region of Spain. It roughly corresponds to the medieval Moorish Taifa of Toledo, taken during the Reconquista of the peninsula by Christians and thus becoming the southern part of Castile. The extension of New Castile was formally defined after the 1833 territorial division of Spain as the sum of the following provinces: Ciudad Real, Cuenca, Guadalajara, Madrid and Toledo.

Key to the reconquest of New Castile were the capture of Toledo in 1085, ending the Taifa's Kingdom of Toledo, and the Battle of Las Navas de Tolosa in 1212. It continued to be formally called Kingdom of Toledo even though it was under the Crown of Castile. Then it started to be called New Castile in the 18th century.

Alfonso VIII (11 November 1155 – 5 October 1214), called the Noble (El Noble) or the one of Las Navas (el de las Navas), was King of Castile from 1158 to his death and King of Toledo. After having suffered a great defeat with his own army at Alarcos against the Almohads in 1195, he led the coalition of Christian princes and foreign crusaders who broke the power of the Almohads in the Battle of Las Navas de Tolosa in 1212, an event which marked the arrival of a tide of Christian supremacy on the Iberian Peninsula.

His reign saw the domination of Castile over León and, by his alliance with Aragon, he drew those two spheres of Christian Iberia into close connection.