Part II of this study was devoted to analysing the textual material that accompanies the Tiburtina in its extant manuscripts. Since devotional and didactic works dominate this material I then considered in particular the Tiburtina’s meaning as an aid for personal reflection on Last Things in a monastic setting. Part III of this study is concerned with how medieval readers reacted to the Tiburtina’s verbatim parallels with the christological prophecies attributed to the Erythraean Sibyl in Augustine’s De Civitate Dei, 18, 23. As explained in Chapter 3, advances in the study of textual reception throw into doubt the prevailing consensus that these close textual parallels served only to add authority to the Tiburtina’s prediction of a Last Emperor.