↑ Barnes, Constantine and Eusebius, pp. 8–9; Barnes, New Empire, pp. 4, 38; Potter, The Roman Empire at Bay, p. 288; Southern, Severus to Constantine, p. 146; Williams, Diocletian, pp. 64–65. The earlier dates for Galerius' appointment have been argued for based on the suggestion that the appointments of Constantius and Galerius were timed coincide (Barnes 1981, 8–9; Southern 1999, 146). Barnes (1982, 62) argues against a dating of 21 May 293 in Nicomedia originating in Seston, Dioclétien, 88ff., stating that the evidence adduced (the Chronicon Paschale 521 = Chronica Minora 1.229 and Lactantius, De mortibus persecutorum 19.2) is invalid and confused. Lactantius is commenting on Diocletian and the place where Diocletian was acclaimed, and that the "Maximianus" in the text is therefore a later gloss; the Paschal Chronicle is not authoritative for this period for events outside Egypt, and may simply be commenting on the day when the laureled image of the new emperors arrived in Alexandria. Potter (2004, 650) agrees that locating the acclamation to Nicomedia is false, but believes that Seston's other evidence makes a strong case for a temporal lag between the two Caesars' acclamations.
