I have consulted too many texts in the research for this novel to list, but some of the principal books I have relied on are listed here:
Bowman, A. K., Garnsey, P. & Cameron, A., (2005) The Cambridge Ancient History: Volume XII, the Crisis of Empire AD 193–337, 2nd edition, Cambridge University Press, Cambridge
Grant, M., (1996) The Severans, the Changed Roman Empire, Routledge, Abingdon
Haas, C., (1997) Alexandria in Late Antiquity, Topography and Social Conflict., The John Hopkins University Press, Baltimore and London
Levick, B., (2007) Julia Domna, Syrian Empress, Routledge, Abingdon
Lindsay, J., (1963) Daily Life in Roman Egypt, Frederick Muller Ltd, London
Lindsay, J., (1965) Leisure and Pleasure in Roman Egypt, Frederick Muller Ltd, London
Lindsay, J., (1968) Men and Gods of the Roman Nile, Frederick Muller Ltd, London
Macleod, R., (2004) The Library of Alexandria, I. B. Tauris & Co Ltd, London
Nixey, C., (2017) The Darkening Age. The Christian Destruction of the Classical World, Macmillan, London
Parson, P.,(2007) City of the Sharp-Nosed Fish, Weidenfeld & Nicolson, London
Pollard, J. & Reid, H., (2006). The Rise and Fall of Alexandria, Birthplace of the Modern World, Penguin, New York
Southern, P., (2001) The Roman Empire from Severus to Constantine, Routledge, Abingdon
Swain, S., Harrison, S. & Elsner, J., (2007) Severan Culture, Cambridge University Press, Cambridge
Sylvänne, I., (2017) Caracalla, A Military Biography, Pen & Sword Military, Barnsley