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In page Kingdom of Asturias:

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In the progress of the Islamic conquest of the Iberian Peninsula, the main cities and administrative centers fell into the hands of Muslim troops. Control of the central and southern regions, such as the Guadalquivir and Ebro valleys, presented few problems for the newcomers, who used the existing Visigothic administrative structures, ultimately of Roman origin. However, in the northern mountains, urban centers (such as Gijón) were practically nonexistent and the submission of the mountainous country had to be achieved valley by valley. Muslim troops often resorted to the taking of hostages to ensure the pacification of the newly conquered territory.[citation needed]