On Virtues and Vices (De virtutibus et vitiis)
De virtutibus et vitiis
Dedicated to Count Wido, Margrave of the March of Brittany (attested in that role in 799), and composed around 799–800 at Charlemagne's court, this liber manualis by Alcuin adapts monastic moral theology for a layman engaged in political and military life. Organised around the virtues (faith, hope, charity, and the cardinal virtues) and then the vices (drawing on Cassian's tradition, including acedia), it shows how a magnate with limited time for formal religious life can pursue salvation through deliberate daily moral choices. Over 140 manuscripts survive, distributed across Europe, testifying to its extraordinary reach throughout the courts, monasteries, and cathedral schools of the Carolingian world and beyond. It opens: 'Memor sum petitionis tuae et promissionis meae'—a reminder that the book is itself an act of friendship and promise-keeping.