Roman roads in Britannia the military road from Carlisle to Corbridge, was built under the Emperor Trajan (ruled 98–117 AD) along the line of the future Hadrian's Wall, which was constructed by his successor Hadrian in 122–132 AD. Scotland ("Caledonia"), including England north of Hadrian's Wall, remained mostly outside the boundaries of "Britannia" province, as the Romans never succeeded in subjugating the entire island, despite a serious effort to do so by governor Gnaeus Julius Agricola in 82–84 AD. However, the Romans maintained a system of forts in the lowland region ca. 80–220 AD to control the indigenous population beyond Hadrian's Wall and annexed
Scotland during the Roman Empire fortification built across the width of what is now northern England. The wall was 80 Roman miles (73.5 statute miles or 117 kilometres) long, its width and height dependent on the construction materials which were available nearby. East of the River Irthing the wall was made from squared stone and measured 3 metres (9.7 ft) wide and 5–6 metres (16–20 ft) high, while west of the river the wall was originally made from turf and measured 6 metres (20 ft) wide and 3.5 metres (11.5 ft) high; it was subsequently rebuilt in stone. The wall was augmented by various ditches,