The Battle of Valdejunquera took place in a valley called Iuncaria (Spanish: val de Junquera) on 26 July 920 between the Islamic Emirate of Córdoba and the Christian armies of the kingdoms of León and Pamplona. The battle, a victory for the Córdobans, was part of the "Campaign of Muez" (Campaña de Muez), which was directed primarily against León's southern line of defence, the County of Castile along the Duero river.
The earliest reference to the battle is found in the Chronicon of Sampiro, a Leonese cleric writing probably in the late 980s. According to Sampiro, the "Agarenes" (descendants of Hagar, i.e. the Muslims) arrived at Mois (Muez), threatening the Kingdom of Pamplona, whose king, Sancho Garcés I requested the aid of Ordoño II of León. The Leonese king encountered the Muslims—whom we know from other sources to have been under the command of their emir, Abd al-Rahman III—in the Valdejunquera and was routed. Two of his bishops, Dulcidio and Ermogio, were taken captive to Córdoba. In exchange for his uncle's freedom, Ermogio's nephew Pelagius, later a martyr, went into captivity instead, while Ordoño ransomed Dulcidio.
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