The Greeks contemptuously called Illyricum
"llyris Barbara," but Naissus (Nis) was the birthplace of Constantine, and it was partly the patriotism of Constantine and his mother Helena, as well as Constantine's grand vision of the world, which compelled him to move the capital of the New Rome to Byzantium, and to elevate Illyricum
into one of the four prefectures of the Roman empire.
110) The bars of less senior and more localized courts, such as the praetorian prefecture of Illyricum
or the bar of Syria Secunda, had smaller limits.
s-au infiintat scaune episcopale in Mursa (azi Osiek), Sirmium (Mitrovita), Cibalae (Vinkovce sau Vinkovat), Bossinae (Petrovat), Singidunum (Belgrad), Viminacium (Kostolat), Horeum Margi (Ciupria), Margum (Dobrovita), Aquae (Negotin), Naisus (Nis), Remesiana (Bela Polanca).
29) Syria, Mesopotamia, and Illyricum
(if not precisely Dalmatia) are known to have been military theaters during his reign, while his family's ties to Apamea justify references to Syria and Laodicea and his personal curiosity about Judaism could have prompted the inclusion of Judea.
Meslin suggests that Germinius changed his allegiance from Nice 360 to the Dated Creed through the influence of the Homoiousians, perhaps even Basil himself, who was exiled to Illyricum
in 360: see Michel Meslin, Les Ariens d'Occident, 335-430 (Paris: Editions de Seuil, 1967), 290.
Ancient Illyria: An Archaeological Exploration (first published as Antiquarian Researches in Illyricum
in Archaeologia 1885 & 1886; other paper in Numismatic Chronicle 1880 and introduction by John Wilkes in Bulletin of the Institute of Archaeology, London 1976).