In autumn/winter of 259 the Juthungi, including the
Suebi, crossed the
Limes Germanicus and invaded Italy (
Failure of the Limes). While Emperor
Gallienus managed to defeat the German invasion at
Mediolanum in 260, the Juthungi had already stopped further north with thousands of Italian captives and copious booty. The inscription of the victory altar indicates that these were met by regular Roman troops and a provincial levy near the Rhaetian provincial capital, and defeated in a two-day battle (24 and 25 April). Until the discovery of the altar, this event was not known. In addition to the record of this event, the inscription also allows further clarification of the expansion and chronology of the so-called
Gallic Empire. Until its discovery, no source indicated that the province of Rhaetia was a part of it; apparently the break-away empire was also established earlier than had previously been assumed. This battle took place in spring, when Emperor Gallienus was still the undisputed and sole ruler of the Empire. But he was not named on the altar since Postumus had already declared himself emperor by the time the inscription was produced in autumn. It was originally assumed that Postumus' usurpation took place only in autumn of 260, but Postumus must have rebelled from his authority already some time before September of this year, probably in June or July. Naturally, after his proclamation a reference to Gallienus was impossible, even though we still don't know when Genialis changed sides. Nevertheless, the political situation changed rapidly. Probably in 262/3, but by 265 at the latest, the Rhaetians were back under the control of Gallienus. At this point followers and supporters of Postumus fell under the
damnatio memoriae. The name of Genialis and the consuls as well as the mention of the army were erased from the inscription; probably they were only covered with stucco and remained readable. The composition of the partially Roman army at this battle is typical of the period. This force, led by Genialis, an officer from the
equites, lacks any regular units of the Rhaetian provincial army, such as the
legio III Italica (which had been stationed at
Castra Regina since c.170). Instead the contingent was formed (perhaps rapidly) of
Germaniciani (members of units of Upper Germania),
milites provinciae Raetiae (presumably
auxiliary troops) and
populares ("locals"), which might mean just armed civilians (perhaps veterans). Perhaps the latter were a kind of citizen militia, raised from the residents of the provincial capital and its hinterland and therefore highly motivated to defeat the German raiders. == Bibliography ==