A member of the Equestrian order, Januarianus served as the Praefectus Aegypti from 282 to 284 under the emperor Numerian. He transferred his loyalty to the incoming emperor Diocletian, who rewarded him with advancement into high office. Sometime between 284 and 289, Januarianus was adlected into the Roman senate, and served as Praetorian prefect to Diocletian at some point.
In 288 Januarianus was granted the office of consul posterior alongside the emperor Maximian. Either during his time as consul or immediately after his replacement by a suffect consul, he was appointed the Praefectus Urbi of Rome, a position he held from 27 February 288 until sometime in AD 289.
- Barnes, Timothy David Constantine and Eusebius (1981)
- Martindale, J. R.; Jones, A. H. M, The Prosopography of the Later Roman Empire, Vol. I AD 260-395, Cambridge University Press (1971)
- Barnes, pg. 5
- Martindale & Jones, pg. 453; Barnes, pg. 287 (Note 27)
- Martindale & Jones, pg. 453
Gaius Aurelius Valerius Diocletianus III
Marcus Aurelius Valerius Maximianus
|Consul of the Roman Empire
with Marcus Aurelius Valerius Maximianus II
Marcus Magrius Bassus
Lucius Ragonius Quintianus