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Centuries: 2nd century - 3rd century - 4th century
- Galerius conquers Ctesiphon on the Persians; in the following peace settlement he returns it in exchange of Armenia
- Pope Marcellinus I succeeds Pope Caius
- Allectus, sucessor by assassination to Carausius and usurper in Britain, is defeated by Constantius Chlorus and Britain is returned to the Roman Empire