The Menapian Carausius, whatever his birthplace,[3] was the forerunner of a numerous class.
Finally, the great raid of 406-7 and its sequel severed Britain from Rome.

A wedge of barbarism was driven in between the two, and the central government, itself in bitter need, ceased to send officers to rule the province and to command its troops.

Britain was left to itself.
Yet even now it did not seek separation from Rome.

All that we know supports the view of Mommsen.

It was not Britain which broke loose from the Empire, but the Empire which gave up Britain.[4] [Footnote 1: Ammianus, xx.1.The expedition was important enough to be recorded--unless I am mistaken--on coins such as those which show victorious Constans on a galley, recrossing the Channel after his success (Cohen, 9-13, &c.).