280

Events

Emperor Probus suppresses the revolt of the usurper Proculus.
Probus chases the Alani off to Asia Minor.
The commander of the Roman fleet on the Rhine, Bonosus, is proclaimed emperor. Beaten by Probus' troops, Bonosus is hung.
In Alexandria, Julius Saturninus, who is in charge of the defense of the East, is declared emperor. He withdraws to Apamea, is besieged and put to death.
Owing to the constant threat of invasion, the cities in Gaul construct or reinforce their defensive walls.

The Kingdom of Wu is dissolved by Jin, finally ending the Three Kingdoms period in the history of China.

The Greek mathematician Pappus demonstrates geometrically the property of the center of gravity.

Saint George, soldier of the Roman Empire and later Christian martyr (or 275, approximate date)