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Iulius Placidianus was a Roman general of the 3rd century. He was a professional soldier who advanced his career under Gallienus
Gallienus
and survived into the age of Claudius II
Claudius II
and Aurelian. Placidianus was consul in the year 273 as the posterior colleague of Marcus Claudius Tacitus, the future emperor[1]. His life presented here is largely derived from L.L. Howe’s history of the Praetorian Prefecture.[2].

Contents

1 Sources 2 Origins 3 Career 4 Notes

Sources[edit] There are two inscriptions relating to Placidianus, both from Gaul. The first dates from 269 in which he is Praefectus Vigilium (i.e. Prefect of the Roman Watch), but commanding an army detachment against the Gallic Empire
Gallic Empire
and based in southern Gaul[3] and the second is datable to the early years of Aurelian's rule when he was acting as Praetorian Prefect.[4] Origins[edit] Placidianus' nomen, Iulius, may indicate a Gallic origin as many Gallic families became Roman citizens under the patronage of the Julio-Claudian
Julio-Claudian
Emperors. However, in the two centuries since the death of the last of the Julio-Caludians, Nero
Nero
Julian clans could well have become much more widely dispersed geographically. His cognomen, i.e. Placidianus, is not sufficiently common to suggest any geographical focus for those choosing it.[5] His date of birth is not known. Similarly, we have no record of him marrying or producing any heirs. Career[edit] Placidianus is first encountered as Prefect of the Roman Watch - see Vigiles
Vigiles
- under Claudius II
Claudius II
in 269. As Claudius had been so closely associated with Gallienus
Gallienus
it is likely that Placidianus too had been a rising star in that Emperor’s entourage. He must, therefore, have been born with or had acquired equestrian status as Gallienus
Gallienus
began the policy of excluding senators from high commands. Claudius apparently valued him sufficiently to use him in a very sensitive posting. That he could be Prefect of the Watch while commanding an army detachment against the Gallic Empire
Gallic Empire
(or, most improbably, the Goths) in southern Gaul supports the notion that high-flying army officers might be rewarded by appointments to offices in the Roman garrison while being given more substantive postings elsewhere in the Empire.[6] Whatever mandate Claudius gave Placidianus when he sent him to Gaul in Gaul it did not include taking direct action against the 'Gallic Empire' for it was during Placidianus's watch in the region that the 'Gallic Emperor' Victorinus
Victorinus
took and sacked the city of Augustodunum (Autun) which had declared for Claudius without Placidianus making any move to relieve it. The most likely explanation for this seemingly extraordinary betrayal of would-be Gallic supporters of Claudius's regime by that Emperor's representative in Gaul is that at this time Claudius was fully engaged either in Italy against the Alamanni
Alamanni
or in the Balkans against the Goths
Goths
and was therefore unwilling to open a second theatre of operations in the western provinces, which would not only have involved a major military effort, but would also have required Claudius to assume responsibility for the defense of the Rhine frontier had he been successful. Against this Placidianus is credited by Alaric Watson[7] with suppressing a potentially dangerous revolt by Domitianus
Domitianus
in the region south of Lake Geneva in 271. However, the most likely location for Domitianus's suppression was the Gallic capital, Augusta Treverorum (Trier), where Placidianus was unlikely to have been operating in 271 so perhaps even this success must be denied him. Whatever the reason for Placidianus's failure to come to the rescue of Autun, he obviously made a sufficiently good impression for Claudius's successor, Aurelian
Aurelian
to appoint him his Praetorian Prefect
Praetorian Prefect
at or soon after his accession. It is not known if he directly succeeded Aurelius Heraclianus who had been Gallienus's last Praetorian Prefect
Praetorian Prefect
and had probably colluded with Claudius and Aurelian
Aurelian
in that Emperor's murder in 268. It is likely that Placidianus was still in Gaul when he was promoted. Howe thinks he remained Praetorian Prefect
Praetorian Prefect
until Aurelian’s death. Nothing is known of Placidianus after the death of Aurelian
Aurelian
in 275. Notes[edit]

^ Alison E. Cooley, The Cambridge Manual of Latin Epigraphy (Cambridge: University Press, 2012), p. 478 ^ Howe, Laurence Lee (1942). The Pretorian Prefect from Commodus to Diocletian (AD 180-305). Illinois: University of Chicago Press.  ^ CIL XII, 2228. ^ CIL XII, 1551. ^ See Kajanto, I. Roman Cognomina, Helsinki, 1965. ^ See Baillie Reynolds, P.K. (1926). The Vigiles
Vigiles
of Imperial Rome. Oxford University Press, London.  In this connection see article on Lucius Petronius Taurus Volusianus ^ Watson, Alaric (1999). Aurelian
Aurelian
and the Third Century. London: Routledge. 

Political offices

Preceded by Titus Flavius Postumius Quietus, Junius Veldumnianus, and Tetricus I Consul of the Roman Empire 273 with Marcus Claudius Tacitus, Tetricus I Succeeded by Aurelia

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