But South of the Antonine Wall. Hadrian's gets all the recognition, and that's probably mostly because it is still recognisable, but the Romans built a second

But South of the Antonine Wall. Hadrian's gets all the recognition, and that's probably mostly because it is still recognisable, but the Romans built a second wall 20 years later, just to the north of where Glasgow and Edinburgh are now - https://en.wikipedia.org/wiki/Antonine_Wall https://en.wikipedia.org/wiki/Antonine_Wall It was built mostly of turf and wood, so time has erased it much more completely, and apparently they retreated back to Hadrian's wall after only a few years.