The isthmus between the Forth and Clyde presents towards the west the appearance of a great valley, having the Campsie and Kilsyth hills on the north, and on the south a series of lesser rising grounds extending in a continuous line from sea to sea; while the hills on the opposite side recede as the valley approaches towards the east, till the view from the southern rising ground extends over the magnificent plain of the Carse of Falkirk, with the upper part of the Firth of Forth stretching along its northern limit. The Roman wall was constructed along the ridge of the southern rising grounds, and the remains of this stupendous work have at all times arrested the attention of even the careless observer. This great work, as it presents itself to the inspection of those who have examined it minutely, consisted of a large rampart of intermingled stone and earth, strengthened by sods of turf, and must have originally measured 20 feet in height, and 24 feet in breadth at the base. It was surmounted by a parapet having a level platform behind it, for the protection of its defenders. In front there extended along its whole course an immense fosse, averaging about 40 feet wide and 20 feet deep. To the southward of the whole was a military way, presenting the usual appearance of a Roman causewayed road. This great barrier extended from Bridgeness, near Carriden, on the Firth of Forth, to Chapelhill, near West Kilpatrick, on the Clyde, a distance of twenty-seven English miles,—having, at intervals of about two miles, small square forts or stations, which, judging from those that remain, amounted in all to nineteen in number, and between them were smaller watch-towers.[[71]]
Such was this formidable barrier in its complete state; but it is not likely that it owed its entire construction to Lollius Urbicus. His work appears to have been limited to what was constructed of turf, and consisted probably only of the earthen rampart itself. Few probably, if any, of the principal ‘castella’ formed part of the original construction, as their remains indicate a more elaborate foundation. Numerous inscriptions have been found along the course of the wall, which show that the ‘vallum,’ as it is termed in these inscriptions, had been constructed by the second, the sixth, and the twentieth legions, or rather by their vexillations. The first and last of these legions had been in Britain since the time of Claudius; the sixth was brought into the island by Hadrian. The inscriptions connect the work with the name of Antoninus, and in one that of Lollius Urbicus has been found.
A.D. 162.
Attempt on the province by the natives.
This great work, guarded as it was by a powerful body of Roman troops, seems to have effectually protected the Roman province in its increased extent during the remainder of the reign of Antoninus. But the first year of a new emperor was, as usual, marked in Britain by an attempt upon the province by the northern tribes, and Calphurnius Agricola was sent to Britain to quell them. This was in the year 162.[[72]]
A.D. 182.
Formidable irruption of tribes north of wall repelled by Marcellus Ulpius.
In the commencement of the reign of Commodus, twenty years later, the irruption was of a more formidable character. The nations on the north of the wall succeeded in breaking through that great barrier, slew the commander with a number of the soldiers who guarded it, and spread devastation over the neighbouring part of the province. The war created great alarm at Rome, and Marcellus Ulpius was sent by Commodus against them,—a general whose character, as drawn by Dio Cassius, peculiarly fitted him for the task, and he appears to have succeeded in repelling the invading tribes, and terminating the war two years later.[[73]]
On the death of Commodus in the year 192, three able generals commanded the Roman troops stationed at the principal points of the boundary of the Roman empire—Pescennius Niger in Syria, Lucius Septimius Severus in Pannonia, and Clodius Albinus in Britain; and after the death of Pertinax and Didius Julianus—the short-lived emperors who had been put up and as speedily deposed by the Prætorian guards—a struggle took place between these generals for the empire. Severus was proclaimed emperor at Rome, but he found himself at once in a position of great difficulty; for both of his rivals were formidable opponents, both were in command of powerful armies devoted to them, and he could not proceed to attack the one without exposing the seat of the empire to be seized upon by the other, or remain at Rome without drawing upon himself the simultaneous attack of both. He therefore caused Albinus to be proclaimed Cæsar, had his title confirmed by the senate, and sent letters to him to invite him to share in the government, but recommended that he should make Britain the seat of his government, and devote himself to the care of that province. An example was thus for the first time set of the command of the troops in Britain being associated with the imperial dignity, which some of the succeeding commanders were not slow to imitate, and a separate interest created with reference to Britain, which tended to isolate it from the rest of the empire, and greatly affected the fortunes of both. It is unnecessary for our purpose to detail the struggle which now took place between Severus and Pescennius Niger, and resulted in the defeat and death of the latter in the year 194. Severus then led his army into Gaul to attack Albinus, who promptly met him by crossing the channel with the British army, and in the battle of Lyons which ensued, he also was defeated and slain in the year 197,[[74]] and Severus found himself in possession of the undivided rule of the Roman world.
A.D. 201.
Revolt of Caledonii and Mæatæ.
It would appear that Albinus, in the course of his government, had come to terms with the barbarians or independent tribes of the north, for four years after this battle we find the natives of the Mæatæ, now for the first time mentioned, threatening hostilities against the Roman province, and the Caledonii, who are accused of not abiding by their promises, preparing to assist them. The governor, Virius Lupus, who had probably been sent as Albinus’s successor, being unable to obtain assistance from Severus in consequence of his being engaged in war elsewhere, appears to have been driven by necessity to purchase peace from the Mæatæ at a great price, a circumstance which shows the formidable character which the independent tribes of the north still bore, and the extent to which they taxed the military ability and energy of the Roman governors to protect the province from their attacks.
A.D. 204.
Division of Roman Britain into two Provinces.