- Jan 18 Roman Emperor Constans is assassinated and the general Magnentius proclaims himself the new Emperor
- Jun 3 Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering Rome at the head of a group of gladiators.
- Jun 30 Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed by troops of the usurper Magnentius, in Rome
Alexander the Great
Archimedes
Aristotle
Pheidippides
Plato
Socrates