The fort was situated between
Vindomora (
Ebchester), and
Vinovia (
Binchester) on
Dere Street, the main Roman road linking
Eboracum (
York) with
Hadrian's Wall. It is about south of the wall, and was built on high ground with clear views around the site. Some archaeologists have postulated that a road may have existed connecting the fort at Longovicium to the one at
Concangis (modern-day
Chester-le-Street), but this has yet to be proven. A construction slab identifies the
Legio XX Valeria Victrix (Twentieth Legion) as having built the fort, but this gives no real clue as to when the fort was built. In 88 AD, the Emperor
Domitian had ordered the Legio XX abandon the fort they had been building in Scotland at
Inchtuthil and redeploy to garrison the legionary fortress
Deva Victrix (
Chester). But the fort is estimated to have been built later than the other forts on
Dere Street, around 150 AD. There is evidence it was rebuilt around 230/240 AD and again in the early 4th century. The rectangular fort, which had rounded not square corners, had four gates and was surrounded by a ditch. Despite never having systematically excavated, archaeologists have found the remains of the headquarters buildings, a
bathhouse and some barracks buildings through the use of
geophysical survey. Remains of a nearby
vicus have been found, and its traces can be seen through aerial photography. A cemetery was also discovered in the 20th century to the southwest of the fort, with examples of stone-lined burials and cremations sites. The fact that the fort is located on fields that have not been ploughed means its condition is remarkable, although stone robbing has taken its toll. A column, probably from the colonnade of the Commandant's House, can be found in the nearby All Saints' Parish Church, as can an altar dedicated to the goddess Garmangabis. ==Aqueducts and reservoirs==