Assassination of Roman Emperor Gallienus

Emperor Gallienus, ruler of the Roman Empire during a time of internal strife and external invasions, was assassinated by his own military officers during a siege. His death marked a critical turning point in the Crisis of the Third Century.

The assassination took place in Mediolanum, a key military and political center in northern Italy. Gallienus's death led to a short period of instability before his successor seized control.