275 CE - The Roman Empire at the death of Aurelian

260 CE - Western provinces break away from Roman control; Gallic Empire (260 CE - 274 CE)
261 CE - Odenathus, Prince of Palmyra, made Governor of the East
262 CE - Raetia recovered from Gallic Empire by Rome
263 CE - Agri Decumates abandoned by Gallic Empire
269 CE - Spanish Provinces return to Roman control
269 CE - Rome seizes control of Gallic territory east of the river Rhône
269-271 CE - Palmyra turns hostile; Palmyrene Empire conquers eastern provinces
272 CE - Dacia abandoned
272 CE - Re-Conquest of the Palmyrene Empire
274 CE - Re-Conquest of the Gallic Empire