- The Early Middle Ages: Europe 400-1000 (Short Oxford History of Europe)
- The Merovingian Kingdoms 450 - 751
- The Missionary Life: Saints and the Evangelisation of Europe, 400 - 1050
- The Modern Origins of the Early Middle Ages
- Jonas of Bobbio: Life of Columbanus, Life of John of Reome, and Life of Vedast