 Scotland in the early Middle Ages , between the end of Roman authority in southern and central Britain from around 400 and the rise of the kingdom of Alba in 900 , was divided into a series of kingdoms . Of these the four most important to emerge were the Picts , the Scots of Dál Riata , the Britons of Alt Clut and the Anglo-Saxons of Bernicia .
The Picts were the only native British race to have developed in Britain before the arrival of the Anglo-Saxons in 600. The Picts were a group of about 200,000 people who had