Alfonso III of Asturias

Alfonso III, called the Great (c. 848–910), succeeded his father Ordoño I as king of Asturias in 866. He fled the usurper Fruela of Galicia, returning after his murder. He crushed a Basque revolt in 867 and around 869 allied with Pamplona, strengthening the bond by marrying Jimena.

Continuing his father's frontier resettlement, his counts took Porto in 868 and Coimbra in 878, advancing the frontier to the Mondego. In 878 he defeated Salid ibn Ghanim's army at Polvoraria and the Córdoban prince al-Mundir at Valdemora, forcing the first truce from Córdoba.

His sons rebelled in 909. He died at Zamora on 20 December 910, and the kingdom was divided among them.