The same Roman tombstone provides details of his career. His first recorded commission was
praefectus of the
Cohors VI Gallorum, which was stationed in
Roman Britain. This was followed by a commission as
tribunus angusticlavius in
Legio VI Victrix also stationed in Britannia. His next two commissions were to units stationed in
Pannonia Superior. The first was as
prefectus of the
Ala III Thracum, the second unit was
prefectus of the
Ala Ulpia contariorum, a cavalry military unit -- a unit one thousand strong. His
tres militiae presents some issues. One is that normally the equestrian career consists of three posts;
Eric Birley has suggested that in the second and third centuries, possibly an innovation of
Hadrian, that a fourth post was added, the command of an
ala miliara, which would explain this fourth posting. As there were only a dozen units of this type in the Roman Empire of the 2nd century AD according to Birley's count, their commanders could be considered the elite of the equestrian military service. The second issue is for which act Vindex received military honors. According to Valerie Maxwell, the scale of his awards better fit a
tribunus laticlavus than an equestrian officer, which is what a
tribunus angusticlavius was. It was while commander of a cavalry unit – most likely the
Ala Contariorum – that Vindex appears in history:
Cassius Dio records that, in the winter of 166/167 and with the help of some infantry under one Candidus, Vindex and his cavalry repulsed a force of
Langobards and
Obii who had crossed the Danube into Roman territory. This victory as a very senior equestrian officer may have been sufficient to justify the awards. The last posting Vindex held as an
equites was as
procurator of
Dacia Malvensis. This was not part of the
tres militiae, but an administrative posting, and its duties included collecting taxes and rents. Anthony Birley suggests the emperor
Marcus Aurelius assigned him this posting because of his military experience, however, due to continued pressure from the barbarians who had re-entered the
Great Hungarian Plain and perhaps even crossed the
Tisza river from the northwest. Vindex had a crucial role in defending Roman territory, for there was a gap in leadership in the time between the disappearance of the governor of Roman Dacia,
Sextus Calpurnius Agricola – possibly dead from the
Antonine Plague, or killed in action – and
Marcus Claudius Fronto, governor of the neighboring province of
Moesia Superior, was able to assume authority in the beleaguered province. == Career as a Roman senator ==