On the contemporary status of Christians in the Roman army, see:
- J. Helgeland, "Christians and the Roman Army from Marcus Aurelius to Constantine", in ANRW 2.23.1 (Berlin, New York, 1979), 724–834.
For a developed political narrative of the period, see:
- X. Loriot, "Les premières années de la grande crise du IIIe siècle: De l'avènement de Maximin le Thrace (235) à la mort de Gordien III (244)", in ANRW 2.2 (Berlin, New York, 1975) 740ff(?).
- L. de Blois, "The Reign of the Emperor Philip the Arabian", Talanta 10-11 (1978-1979) 40ff.
On the dating of Philip's return to Rome, see:
- Dennis E. Trout, "Victoria Redux and the First Year of the Reign of Philip the Arab", Chiron 19 (1989) 221-33.
On imperial itineraries in general, see:
- H. Halfmann, Itinera pnncipum. Geschichte und Typologie der Kaiserreisen im Romischen Reich (Stuttgart, 1986)