Blatobulgium was a Ancient Rome castra, located at the modern-day site known as Birrens, in Dumfriesshire, Scotland. It protected the main western road to Scotland.
It was one of the "outpost forts" outside the Roman Empire when the frontier was on Hadrian's Wall and was located about 11 miles from the Castra Exploratorum fort (Netherby, Cumbria).
Name
Blatobulgium is recorded in the Antonine Itinerary. The name derives from the
Common Brittonic roots
*blāto- 'bloom, blossom' or
*blāto- (from earlier
*mlāto-), 'flour' and
*bolgo-, 'bag, bulge'. The name may mean 'flowery hillock' or 'flowery hollow'. However, as there are granaries at the fort, Blatobulgium may be a nickname meaning '
Flour Sacks'.
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See also
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The interpretations of the name are summarised by
History
/ref> at least one of which was first occupied in the
/ref> Under Hadrian when the frontier was established on Hadrian'
/ref> The visible fort and its internal buildings date from the Antonine period around 142 after the reconquest of the Scottish Lowlands when the earlier fort was rebuilt and enlarged to protect the western road to the
Antonine Wall and to accommodate a nominally 1,000-strong
milliaria equitata
/ref> a mixed unit of cavalry and infantry of the auxiliary army. It was destroyed perhaps by enemy action around 155 and the replacement stone buildings, although of much poorer quality, in the second Antonine period dating to 159 onwards were for the new garrison of the 2nd Cohort of Tungrians, likewise
milliaria equitata. From about 163 it was again an outpost of Hadrian's Wall and was finally abandoned by about 184.
The later fort formed the northern terminus of the Roman Empire-era Watling Street (using an extended definition of this road), or more simply Route 2 of the Antonine Itinerary. It was located in the territory of the Selgovae.
Finds
There have been more inscribed and sculptured stones found at Birrens than anywhere else in Scotland.
An altar stone dedicated to the Celtic goddess
Ricagambeda was found at Birrens.