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Events

By Place

Roman Empire

* March 1 — Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This is considered the beginning of the Tetrarchy.
* Constantius Chlorus restores the northern Rhine border after defeating the Franks. Franks keep living in the north, because the Roman population has fled.
* Constantius Chlorus retakes northern Gaul from the usurper Carausius, who retains control of Britain
* Allectus assassinates Carausius and usurps power in Britain.

Asia

* Sassanid Shah Bahram III succeeds Bahram II.
* Sassanid Shah Narseh succeeds Bahram III.
* Tuoba Fu succeeds Tuoba Chuo as chieftain of the Chinese Tuoba clan.

By Topic

Religion

* Probus succeeds Rufinus as Patriarch of Constantinople.

Births

*

Deaths

* Tuoba Chuo, chieftain of the Chinese Tuoba tribe
* Carausius, usurper in northern Gaul and Britain