 The cultural endowment of the monastery was extensive; by 848 its collection of manuscripts included Vergil, Horace, Juvenal, Porphyry, Aldhelm, and Augustine of Hippo's "De Civitate Dei".In the later 9th century, the Carolingians ceased to be powerful sovereigns in the outyling regions of their empire and the Moors of the Ebro valley simultaneously ceased being a threat to the Christian population to their north.As Carolingian influence waned, the counts of Aragón sought new allies.