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250 CE 260 CE 270 CE
253 CE - 268 CE: Reign of Gallienus in Rome.
260 CE: Postumus founds the "breakaway" Gallic Empire, seceding from Roman Empire.
260 CE - 269 CE: Postumus rules the "breakaway" Gallic Empire.
260 CE - 274 CE: The Gallic Empire.
268 CE: Gallienus defeats Aureolus at Mediolanum.