Banna, Birdoswald

A Roman fort on Hadrian's Wall in Cumbria, built from AD 122 and spanning 2.14 hectares, making it one of the larger forts on the Wall. Named Banna ("horn" in Celtic) for its triangular spur above the River Irthing, it was garrisoned by the 1,000-strong Cohors I Aelia Dacorum from present-day Romania. The fort is attached to the longest surviving stretch of Hadrian's Wall and is the only site on the Wall with proven post-Roman occupation, where timber halls were built atop the granaries into the early 6th century.