Mattingly, D. (2006) An Imperial Possession: Britain In the Roman Empire. The Penguin History of Britain. London: Penguin.
McCarthy, M. (2002) Rheged: an Early Historic Kingdom near the Solway. Proceedings of the Society of Antiquaries of Scotland 132. P. 357381.
McCarthy, M. (2011) The Kingdom of Rheged: A Landscape Perspective. Northern History 48:1. P. 9–22.
McErlean, T. and Crothers, N. (2007) Harnessing the Tides: The Early Medieval Tide Mills at Nendrum Monastery, Strangford Lough. Northern Ireland Archaeological Monographs 7. Belfast: The Stationery Office.
McGrail, S. (1990) Maritime Celts, Frisians and Anglo-Saxons. CBA Research Report 71. York: Council for British Archaeology.
McOmish, D., Field, D. and Brown, G. (2002) The Field Archaeology of the Salisbury Training Area. Swindon: English Heritage.
Medlycott, M. (2011) The Roman Town of Great Chesterford. East Anglian Archaeology Report 137. Essex County Council.
Millett, M. (1990) The Romanization of Britain: An Essay In Archaeological Interpretation. Cambridge: Cambridge University Press.
Millett, M., Revell, L. and Moore, A. (eds) (2011) The Oxford Handbook of Roman Britain. Oxford: Oxford University Press.
Moisl, H. L. (1983) The Bernician Royal Dynasty and the Irish In the Seventh Century. Peritia 2. P 103–126.
Mommsen, T. (ed.) (1892) Prosperi Tironis epitoma chronicon ed. primum a. CCCCXXXIII, continuata ad a. CCCLV // Mommsen, T. (ed.) Chronica minora saec. IV, V, VI, VII, vol. 1, MGH Scriptores. Auctores antiquissimi 9. Berlin: Weidmann. P. 341–499.
Montgomery, J., Evans, J. A., Powlesland, D. and Roberts, C. A. (2005) Continuity or Colonisation In Anglo-Saxon England? Isotope Evidence for Mobility, Subsistence Practice, and Status at West Heslerton. American Journal of Physical Anthropology 126. P. 123–138.
Morris, J. (1973) The Age of Arthur. London: Weidenfeld & Nicolson.
Morris, J. (ed) (1980) Nennius. British History and the Welsh Annals. Arthurian Period Sources 8. London: Phillimore.
Morris, J. (ed) (1995) Arthurian Period Sources 3: Persons. London: Phillimore.
Morris, R. K. (1989) Churches In the Landscape. London: Phoenix.
Muhlberger, S. (1981) The Fifth-Century Chroniclers: Prosper, Hydatius, and the Gallic Chronicler of 452. ARCA Classical and Medieval Texts, Papers and Monographs 27. Cambridge: Francis Cairns.
Myres, J. N. L. (1986) The English Settlements. Oxford: Clarendon Press.
Natal, D. (2018) Putting the Roman Periphery on the Map: the Geography of Romanness, Orthodoxy and Legitimacy In Victricius of Rouen’s De Laude Sanctorum. Early Medieval Europe 26:3. P. 304–326.