- Roman Empire
- --- Roman 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.
- Europe
- ---The Germanic tribe Thuringii appears.
- Arts and Sciences
- ---The Greek mathematician Pappus demonstrates geometrically the proprty of the centre of gravity.
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