invasion, he abandoned the province of Dacia north of the Danube in order to rationalize the defense of the Empire. Citations References Primary sources Zosimus, Historia Nova (), book 1, in Corpus Scriptorum Historiae Byzantinae, ed. Bekker, Weber, Bonn, 1837 George Syncellus, Chronographia (), in Corpus Scriptorum Historiae Byzantinae, ed. Dindorf, Bonn, 1829 Scriptores Historiae Augustae, Vita Gallieni Duo & Vita Divi Claudii, Loeb Classical Library, 1921–1932 (English translation), on-line at Lacus Curtius Zonaras, Epitome historiarum (), book 12, in Patrologia Graeca, ed. J.P.Migne, Paris, 1864, vol 134 Secondary sources Bray, John. Gallienus: A Study in Reformist and Sexual Politics, Wakefield Press, 1997. Potter, David S. The Roman Empire at Bay AD 180–395, Routledge, 2004. Southern, Pat. The Roman Empire from Severus to Constantine, Routledge, 2001. Watson, Alaric. Aurelian and the Third Century, Routledge, 2003. Wolfram, Herwig. History of the Goths'' (transl. by Thomas J. Dunlap), University of California Press, 1988. 268 Naissus Crisis of the Third Century Naissus Naissus Naissus Military history of Serbia Serbia in the Roman era History of Niš Aurelian