Blatobulgium was a Roman fort, 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).
Blatobulgium is recorded in the Antonine Itinerary. The name derives from the 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'. [1]
There are several camps near Birrens [2] at least one of which was first occupied in the Flavian period from 79 AD onwards probably during the Agricolan campaigns, when its internal buildings were presumably of timber. [3] Under Hadrian when the frontier was established on Hadrian's Wall soon after 122, a new fort was constructed as an outpost fort on the site of a late 1st century fortlet with central timber buildings and a large western annexe. [4] 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 garrison of the 1st Cohort Nerviana Germanorum, [5] 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-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.
There have been more inscribed and sculptured stones found at Birrens than anywhere else in Scotland. [6] An altar stone dedicated to the Celtic goddess Ricagambeda was found at Birrens. [7]
Watling Street is a historic route in England that crosses the River Thames at London and which was used in Classical Antiquity, Late Antiquity, and throughout the Middle Ages. It was used by the ancient Britons and paved as one of the main Roman roads in Britannia. The route linked Dover and London in the southeast, and continued northwest via St Albans to Wroxeter. The line of the road was later the southwestern border of the Danelaw with Wessex and Mercia, and Watling Street was numbered as one of the major highways of medieval England.
The Selgovae were a Celtic tribe of the late 2nd century AD who lived in what is now Kirkcudbrightshire and Dumfriesshire, on the southern coast of Scotland. They are mentioned briefly in Ptolemy's Geography, and there is no other historical record of them. Their cultural and ethnic affinity is commonly assumed to have been Brittonic.
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Cohors PrimÆ Ælia Dacorvm was an infantry regiment of the Auxilia corps of the Imperial Roman army. It was first raised by the Roman emperor Hadrian in the Roman province of Dacia not later than AD 125 and its last surviving record dates c. 400. It was deployed, for virtually its entire history, in forts on Hadrian's Wall on the northern frontier of Britannia province.
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Anne Strachan Robertson FSA FSAScot FRSE FMA FRNS was a Scottish archaeologist, numismatist and writer, who was Professor of Roman Archaeology at the University of Glasgow and Keeper of the Cultural Collections and of the Hunterian Coin Cabinet at the Hunterian Museum. She was recognised by her research regarding Roman Imperial coins and as "a living link with the pioneers of archaeological research".
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