400       

400-421
It has been said that the famous Stilicho distinguished himself in Britain, but other authorities state that it was the terror caused by his crushing defeat of the Saxon pirates, the scourges of the northern coast, which led the Picts to retreat from Britain to their mountain fastnesses.(7)

407-411
The accession of Theodosius II., about A.D. 407, led to the apprehension of a Vandal invasion, and the Britons, with the Roman troops stationed in the island, revolted and proclaimed Marcus, who in a few months was killed and succeeded by Gratian, described as a native, whose reign was equally brief. The next Emperor was a common soldier, bearing the auspicious name of Constantine, who went to Gaul with a large following from this island, and. conquered Spain and Northern Italy, and was assassinated A.D. 411.  The revolt, however, had taken the best strength and blood from the land, and when the legions were recalled the country fell an easy prey to the attacks of the Picts and Scots. The exact date of the withdrawal of the Roman troops is not known, but "historians agree that it was in the earlier part of the reign of Theodosius II (A.D. 402-450) that Britain, with several other provinces, was lost to the empire. Numismatic evidence confirms this, for while the coins of Honorius and Arcadius are plentiful, those of Theodosius II are few, and of Vallentinian III (A.D. 425-455) very rare - probably accidentally lost in the course of commercial transactions. Lancashire has yielded very few coins of even Arcadius and Honorius" (Wathin).(7)