Virosidum was a Roman fort and settlement situated near to the modern town of Bainbridge, North Yorkshire, England.^[1] The site is a Scheduled monument.^[2]

Quick Facts Alternative name(s), Known also as ...

Virosidum
Bainbridge fort within North Yorkshire
Alternative name(s)	Virosidum
Known also as	Bainbridge Roman Fort
Founded	c. AD 90
Place in the Roman world
Province	Britannia
Stationed military units
— Cohorts —
Cohors VI Nerviorum
Location
Coordinates	54.306°N 2.097°W / 54.306; -2.097
Town	Bainbridge
County	North Yorkshire
Country	England
Reference
UK-OSNG reference	SD93769015
Site notes
Condition	Ruined

Close

The fort occupies a strategic position on the summit of Brough Hill, between the confluence of the River Bain and River Ure. It has views across Wensleydale and may have been placed to control a pass through the Pennines between Stainmore and the Ilkley/Aire gap.^[2]

• The plateau on which Virosidium was constructed
• The Roman road near Virosidium, now a bridle path

While the fort may have had an earlier phase, the visible remains date to AD 90–105. It initially had an earth and timber rampart which was rebuilt in stone around AD 190.^[2]

The visible outline of the defences of the fort contains an area of 1.16 Hectares (2.8 acres).^[3] The fort platform survives to a height of 3.9 m and it is surrounded by a single ditch on the north, east and south sides, with a series of five ditches on the west. An annexe to the fort measures 99 m x 73 m.^[1]

The site was abandoned between c.120 and c.160.^[3] The fort interior was rebuilt in the early third century by the Cohors VI Nerviorum.^[4] Rebuilding across the whole site took place in the late fourth century, with pottery evidence suggesting a late abandonment.^[2]

In William Camden's 1586 Britannia the fort is referred to under the name Bracchium and this name persisted in early editions of the Ordnance Survey maps. The fort was first excavated by John Kirk and R. G. Collingwood in 1925–6, then by John Percival Droop for Liverpool University in 1928-9 and 1931. Under lease to Leeds University, further excavations were directed by William V. Wade in 1950-3 and by Brian Hartley annually from 1956 to 1969.^[1]

There is no clear evidence of continuity into the fifth century at the fort. However, a pair of post-Roman burials were discovered in the principia. One is of an adult aged 36–45 years old and the other of a woman aged 46+ years. Radiocarbon dating of the skeletal remains dated them to the ninth or tenth centuries AD. Isotope analysis of the strontium and oxygen values of their teeth found that the woman was probably local to the Yorkshire region but that the other skeleton was from a western coastal part of Britain or continental Europe. These burials may be consistent with structural changes to the western wall of the principia and the aedes that suggest it was used as a church.^[9]