In 844 a king of the Scots, named Kenneth MacAlpin, became (we don't quite know how) king of the Picts also, joining two strong races under one ruler, and thus was powerful enough to give great trouble to the weakened kingdom of Northumbria. He several times led his army through Lothian, the district belonging to the Angles between the Forth and the Tweed, but was never quite able to conquer it. It is important to remember that up to that date Lothian had never belonged to Scotland. The appearance of the Danes added to the confusion of those restless days. For some few years it was doubtful whether Scot, Dane, or Angle would get the best of it in Northumbria. But at last the genius of Athelstan of Wessex revived the power of the Angles over the whole of that large part of the island which they had settled, right up to the Forth itself. Edinburgh was still English in 957, and the border-line was still very far from the present one. But there was no longer a king of Northumbria; only an earl, who was subject to the will of the West-Saxon kings.
This fact of the dominance of the West Saxons, whose capital was far to the south at Winchester, must have added to the weakness of the Northumbrian border. By the year 963 the Scots had conquered Edinburgh, and it was now never again to return to English rule. Before very long the whole of Lothian had passed under Scottish control; but it was not yet held to be part of Scotland. Nor must it be thought that this conquest of Lothian fixed the border-line in its present position, for the king of the Scots was at that time ruler over Cumberland, which had never yet been English and was all that was left of the old British kingdom of Cumbria.
Frontier wars with varying successes between Scot, Angle, and Dane mark the stormy history of this time. The power of Cnut held back the Scotch attempts upon Nothumberland; but during a lull in the wars the grand-son of the Scottish king married the sister of Earl Siward, and received as her dowry twelve towns in the valley of the Tyne, an astonishingly imprudent arrangement.
At the time of the battle of Hastings, the earldom of Northumberland was so far distant from Winchester as to be somewhat out of the control of the King of England; the power of the Scottish kings threatened it; they held twelve towns in Tynedale, and Cumberland was a part of Scotland. The Northumbrians refused to accept William the Conqueror as their king; and had they been able to make good their refusal, they must sooner or later have been conquered by the Scots, and the border-line between England and Scotland would then most probably have been formed by the Tees, the mountain boundary of Westmoreland, and Morecambe Bay.
But William was not a king to be played with. He reduced Northumberland to subjection and carried his army into Scotland as far as the river Tay, where he forced the King of Scotland to admit that he, William, was his overlord.
Notwithstanding this humiliation, when King William returned to Winchester, the Scots several times went back to their favourite amusement of raiding unhappy Northumberland.
One of these invasions took place in the reign of William Rufus (1093), who went north in person. He doubtless recognised the fact that owing to the Scots possessing Cumberland they were in the strong position of being able to attack Northumberland on two sides. He took Cumberland by force of arms, and thus for the first time it became a part of England (the word "Cumberland" means the land of the Cumbrians or Welsh, a Saxon form of the Welsh word Cymry).
Rufus rebuilt the strong fortress of Carlisle to defend his new border at its weakest corner. For the most part this border is excellently protected by the natural rampart of the wild Cheviot Hills, and is in every way as good a border as could be devised. It runs in a fairly straight line from south-west to north-east, across a narrow part of the island.
But although this border-line proved to be a permanent one, it must not be thought that it remained undisputed. The times were rough, and hardy fighting folk lived on the Border. They had many grounds for quarrel, and took advantage of them all. For one thing, the exact boundary of North Cumberland was never quite defined till 1552; up to which year there was a tract of land between the rivers Esk and Sark, which was claimed by both countries, and therefore called the "Debateable Land." Then the Scots maintained that they were overlords of Northumberland, while the English kings cherished the notion that they were overlords of the whole island of Britain, and the wild spirits on both sides were always ready to fight.
Out of this fighting spirit sprung the stirring history of the Border, which forms the theme of the deathless Ballads, the stories of which it is now our purpose to retell.