This book considers how ancient and medieval commentaries on the Aeneid by Servius, Fulgentius, Bernard Silvestris, and others can give us new insights into four twelfth-century Latin epics—the Ylias by Joseph of Exeter, the Alexandreis by Walter of Châtillon, the Anticlaudianus by Alan of Lille, and the Architrenius by John of Hauville. Virgil’s influence on twelfth-century Latin epic is generally thought to be limited to verbal echoes and occasional narrative episodes, but evidence is presented that more global influences have been overlooked because ancient and medieval interpretations of the Aeneid, as preserved by the commentaries, were often radically different from modern readings of the Aeneid. By explaining how to interpret the Aeneid, these commentaries directly influenced the way in which twelfth-century Latin epic imitated the Aeneid. At the same time, these Aeneid commentaries allow us a greater awareness of the generic expectations held by the original readers of twelfth-century Latin epic. Thus, this book provides a new way to look at the development of allegory and contributes to our understanding of ancient and medieval perceptions of the Aeneid while exploring the importance of commentaries in shaping poetic composition, imitation, and reading.