Lying midway along Hadrian’s Wall, Housesteads is the most complete example of a Roman fort in Britain, and one of the best-known from the entire Roman Empire. It was built within a decade of AD 122, when work on the Wall began, and was garrisoned by an 800-strong infantry regiment until the end of the 4th century. Excavations have revealed major buildings, defences and the civilian settlement outside its walls.