with Barri Jones, The Carvetti, Sutton (Gloucester, England), 1985, new edition, 1991.
The Northern Counties to AD 1000, Regional History of England, Longman, (New York, NY), 1986.
Rome, Britain, and the Anglo-Saxons, Seaby (London, England), 1992.
The Kingdom of Northumbria: AD 350-1100, Sutton (Gloucester, England), 1993.
The Origins of Cheshire, Manchester University Press (Manchester, England), 1993.
An English Empire: Bede and the Early Anglo-Saxon Kings, Manchester University Press (Manchester, England), 1995.
The English Conquest: Gildas and Britain in the Fifth Century, Manchester University Press (Manchester, England), 1994. (review by Christopher A. Snyder[3])
The Convert Kings: Power and Religious Affiliation in Early Anglo-Saxon England, Manchester University Press (Manchester, England), 1997.
The Death of Anglo-Saxon England, Sutton (Gloucester, England), 1997.
The Norman Conquest, Sutton (Gloucester, England), 1998.
King Arthur: Myth-making and History, Routledge (New York, NY), 2002.