Political map of Europe & the Mediterranean January 262 (Odaenathus): The collapse of the Macriani was exploited by Odaenathus of Palmyra (Palmyrene Empire), who eliminated the remaining Macrianian emperor Quietus and rapidly consolidated his hold over the East, ostensibly on behalf of Gallienus. After defeating the last of the eastern rebels (Lucius Mussius Aemilianus) in early 262, Gallienus approved a Roman–Palmyrene campaign against Persia (Battle of Ctesiphon (263)).