Seleucia, on the western bank of the Tigris, about forty-five miles to the north of ancient Babylon, was the capital of the Macedonian conquests in Upper Asia. Many ages after the fall of their empire, Seleucia retained the genuine characters of a Grecian colony, arts, military virtue, and the love of freedom. The independent republic was governed by a senate of three hundred nobles; the people consisted of six hundred thousand citizens; the walls were strong, and as long as concord prevailed among the several orders of the state, they viewed with contempt the power of the Parthian: but the madness of faction was sometimes provoked to implore the dangerous aid of the common enemy, who was posted almost at the gates of the colony. The Parthian monarchs, like the Mogul sovereigns of Hindostan, delighted in the pastoral life of their Scythian ancestors; and the Imperial camp was frequently pitched in the plain of Ctesiphon, on the eastern bank of the Tigris, at the distance of only three miles from Seleucia. The innumerable attendants on luxury and despotism resorted to the court, and the little village of Ctesiphon insensibly swelled into a great city. Under the reign of Marcus, the Roman generals penetrated as far as Ctesiphon and Seleucia. They were received as friends by the Greek colony; they attacked as enemies the seat of the Parthian kings; yet both cities experienced the same treatment. The sack and conflagration of Seleucia, with the massacre of three hundred thousand of the inhabitants, tarnished the glory of the Roman triumph. Seleucia, already exhausted by the neighborhood of a too powerful rival, sunk under the fatal blow; but Ctesiphon, in about thirty-three years, had sufficiently recovered its strength to maintain an obstinate siege against the emperor Severus. The city was, however, taken by assault; the king, who defended it in person, escaped with precipitation; a hundred thousand captives, and a rich booty, rewarded the fatigues of the Roman soldiers. Notwithstanding these misfortunes, Ctesiphon succeeded to Babylon and to Seleucia, as one of the great capitals of the East. In summer, the monarch of Persia enjoyed at Ecbatana the cool breezes of the mountains of Media; but the mildness of the climate engaged him to prefer Ctesiphon for his winter residence.