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, Bonosos 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 at death.
Owing to the constant threat of invasion, the cities in Gaul construct or reinforce their defensive walls.

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

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

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