Severus, the only black Roman emporer was the last one to try to conquer the whole of Britain. However the scots were too well spread out and would not fight how the romans wanted them to they preferred hit and run tactics. Severus was ill when he was here and intended to returne to Rome. However, he never made it and died in York. This was the last time the romans made any real effort to conquer although many of them remained to live here