Britanniae generally followed Ptolemy's map but made novel assertions regarding Damnonii towns. Later history After the final retreat of Rome from Scotland in the year 210 AD, the Damnonii disappear from history, it is unknown when they centralised to form Strathclyde. Letters by Saint Patrick write of the "king of Altclut" (Ceretic Guletic) in the early 400s, with his ancestors being Damnonii leaders with Romanised names, suggesting that there was some degree of Romanisation among the elite Damnonii or renewed contact with the Empire. From this point on the Kingdom of Strathclyde seems to take the place of the Damnonii in history. Relations with Rome No evidence, either literary or archaeological points to any battle between the Damnonii and the Romans, suggesting then that the two co-operated. However the large surge in forest cover over Scotland in the 2nd century does point to a drop in the native population, most likely due to disease. Southern Scotland essentially acted as a frontier zone between Britannia Inferior and the Caledonians to the north. However, attacks on Hadrian's Wall later in the 2nd century may show a change in relations between the two. In 364, a people known as the Attacotti despoiled Roman Britain, along with the Irish, Picts and Saxons. The Attacotti may have been the Damnonii, as one of their forts was called Alt Clut, (Rock of the Clyde), which later became the capital of Ystrad Clud. See also Ptolemy's Geography Scotland during the Roman Empire Roman Britain Novantae Otalini Selgovae Walls Loch Notes Tribes of ancient Scotland Celtic Britons Scotland in the Roman era Historical Celtic peoples Tribes mentioned by Ptolemy