Article / Updated 03-26-2016
The first king who is generally regarded as having ruled over all of Scotland was Kenneth MacAlpin, who had managed to conquer both the Picts and the Scots by 842. No-one knows exactly when he was declared king, so 843 is an approximation. All the kings of Scotland until the thirteenth century were descended from Kenneth MacAlpin whether through the male or female line, though different branches of the royal house were often deadly rivals for the throne.