Page:Decline and Fall of the Roman Empire vol 1 (1897).djvu/373

Rh people. The Sibylline books enjoined ceremonies of a more harmless nature, processions of priests in white robes, attended by a chorus of youths and virgins; lustrations of the city and adjacent country; and sacrifices, whose powerful influence disabled the barbarians from passing the mystic ground on which they had been celebrated. However puerile in themselves, these superstitious arts were subservient to the success of the war; and if, in the decisive battle of Fano, the Alemanni fancied they saw an army of spectres combating on the side of Aurelian, he received a real and effectual aid from this imaginary reinforcement.

But, whatever confidence might be placed in ideal ramparts, the experience of the past, and the dread of the future, induced the Romans to construct fortifications of a grosser and more substantial kind. The seven hills of Rome had been surrounded by the successors of Romulus with an ancient wall of more than thirteen miles. The vast inclosure may seem disproportioned to the strength and numbers of the infant state. But it was necessary to secure an ample extent of pasture and arable land against the frequent and sudden incursions of the tribes of Latium, the perpetual enemies of the republic. With the progress of Roman greatness, the city and its inhabitants gradually increased, filled up the vacant space, pierced through the useless walls, covered the field of Mars, and, on every side, followed the public highways in long and beautiful suburbs. The extent of the new walls, erected by Aurelian, and finished in the reign of Probus, was magnified by popular estimation to near fifty ; but is reduced by accurate measurement to about twenty-one miles. It was a great but a melancholy labour, since