 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.