July
Saloninus orders Postumus to hand over some booty from a German campaign.
August
Postumus besieges Saloninus at Colonia Agrippina. Saloninus is turned over to Postumus’ troops, who kill him.
September
Postumus declares the Gallic Empire in a revolt against Gallienus.
Britannia and Hispania acknowledge Postumus as Emperor.
Postumus establishes his capital at Trier.
Postumus conducts a successful campaign against the Franks.
Gallienus surrounds the forces of the Gallic Empire under Postumus, but is wounded by an arrow and forced to flee.
Postumus leads a successful campaign against the Alemanni.
Gallienus attacks Postumus, who escapes due to a mistake by Gallienus’ commander Aureolus.
Postumus and Victorinus are consuls of the Galliic Empire.
Aureolus rebels from Gallienus and declares for Postumus.
February
Laelianus is raised by troops as a usurper to Postumus in the Gallic Empire.
June
Postumus captures and kills Laelianus by capturing Mogontiacum. When Postumus’ soldiers wish to plunder the city and Postumus refuses to allow them, they kill Postumus and install Marius as Emperor.