Battle of the Margus
The Battle of the Margus or Battle of Margum was fought in July 285 for control of the Roman Empire between the armies of Diocletian and Carinus in the valley of the Margus River (today Great Morava) in Moesia (present day Serbia), probably near the settlement of Margum. The battle proved to be the tipping point that led to the eventual resolution of the Crisis of the Third Century and the return of stability to the Empire.