Reconquista
Kingdom of León (910–1230)

Alfonso III of Asturias repopulated the strategically important city Leon and established it as his capital. King Alfonso began a series of campaigns to establish control over all the lands north of the Douro river. He reorganised his territories into the major duchies (Galicia and Portugal) and major counties (Saldaña and Castile), and fortified the borders with many castles. At his death in 910 the shift in regional power was completed as the kingdom became the Kingdom of León. From this power base, his heir Ordoño II was able to organize attacks against Toledo and even Seville.

The Caliphate of Córdoba was gaining power, and began to attack Leon. King Ordoño allied with Navarre against Abd-al-Rahman, but they were defeated in Valdejunquera in 920. For the next 80 years, the Kingdom of León suffered civil wars, Moorish attack, internal intrigues and assassinations, and the partial independence of Galicia and Castile, thus delaying the reconquest and weakening the Christian forces. It was not until the following century that the Christians started to see their conquests as part of a long-term effort to restore the unity of the Visigothic kingdom.

The only point during this period when the situation became hopeful for Leon was the reign of Ramiro II. King Ramiro, in alliance with Fernán González of Castile and his retinue of caballeros villanos, defeated the Caliph in Simancas in 939. After this battle, when the Caliph barely escaped with his guard and the rest of the army was destroyed, King Ramiro obtained 12 years of peace, but he had to give González the independence of Castile as payment for his help in the battle. After this defeat, Moorish attacks abated until Almanzor began his campaigns. Alfonso V finally regained control over his domains in 1002. Navarre, though attacked by Almanzor, remained intact.

The conquest of Leon did not include Galicia which was left to temporary independence after the withdrawal of the Leonese king. Galicia was conquered soon after (by Ferdinand, son of Sancho the Great, around 1038). Subsequent kings titled themselves kings of Galicia and Leon, instead of merely king of Leon as the two were in a personal union.

At the end of the 11th century, King Afonso VI of León reached the Tagus (1085), repeating the same policy of alliances and developing collaboration with Frankish knights. The original repoblación was then complete. His aim was to create a Hispanic empire like the Visigothic Kingdom (418–720) to reclaim his hegemony over the entire Iberian Peninsula. Within this context, the territory between the Douro and the Tagus was repopulated and a western nucleus was formed in Portugal that wanted independence. This marks the beginning of the Portuguese Repovoação ou Repovoamento occurred during the reigns of the House of Burgundy up to the middle of the thirteenth century when the Portuguese Reconquista was also brought to an end with the ultimate conquering of Gharb al-Andalus when in March 1249 the city of Faro was conquered by Afonso III of Portugal.
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