Greatest Expansion of the Roman Empire - When?

[Gluteus Maximus]

When I first arrived in UK many years ago, the school taught 'the Romans never made it past Hadrians wall, '.....that was all you got from them.

Indeed, and another popular misconception is that the Caledonian tribes were too fierce for the Romans to subjugate. Something even as a child I found puzzling, given that the entire population of Northern Scotland and the isles could not have been more than about ten thousand. It seems that the idea of Scotland being too sparsely populated to be economically viable is too complex for schoolchildren in the views of some.