The most important ancient sources for the battle are Lactantius, De mortibus persecutorum 44; Eusebius of Caesarea, Ecclesiastical History ix, 9 and Life of Constantine i, 28–31 (the vision) and i, 38 (the actual battle); Zosimus ii, 15–16; and the Panegyrici Latini of 313 (anonymous) and 321 (by Nazarius).
