Not many years after this account of the tribes, the Roman wall was constructed between the Firths of Forth and Clyde, through the heart of the territories of the ‘Damnonii,’ thus dividing the nation into two parts, one of which was included within the province and subjected to the Roman government, while the other remained beyond the boundary of Roman Britain. Of the towns enumerated by Ptolemy, three were now within the province, and the other three were situated north of the wall. When the Roman classical writers again furnish us with any particulars of these tribes, we find that the progress of social organisation had advanced a step further, and that they were now combined into two nations—the ‘Caledonii’ and the ‘Mæatæ.’ The historian Dio expressly states that these were the two divisions of the hostile nations beyond the Roman province, and that all other names of tribes beyond the wall had merged into these two denominations, of which, he adds, the ‘Mæatæ’ were next the wall. The name of ‘Caledonii’ identifies that nation with the group of northern tribes, of which the ‘Caledonii’ were the leading tribe, while the ‘Mæatæ’ must have included those extending from the ‘Caledonii’ to the wall. The ‘Mæatæ,’ soon after they first appear under that name, were obliged to yield up a considerable portion of this territory to the Romans. The ceded district must have been that nearest the wall; and if, as we have seen, it consisted of the plains extending from the wall to the Tay, it included exactly that portion of the nation of the ‘Damnonii’ which lay on the north side of the wall, who now passed under the Roman influence, as well as the southern portion of that nation.