In the reign of Heraclius its garrison was strengthened, that it might be enabled to withstand the Arabs; and when Christianity gained the ascendancy under Constantine, he shut up many pagan temples; but it was Theodosius, who converted its temple into a Christian church, the walls of which are still standing. The conversion of it into a fortress was the work of the Caliphs, when this part of the world fell under the government of the Caliphs, called the Ommiades; an incurious and therefore an ignorant race, during whose time nothing is recorded of Balbec, although it was then a considerable city. The ancient name, Balbec, during this time was restored, instead of Heliopolis, which was probably a translation of Balbec, or at least substituted for it, when it passed out of the possession of its own native oriental inhabitants. In Ebn Haukal's[139] oriental geography, Balbec is mentioned thus:--"Beyond the borders of Demeshk is Baalbek, situated on an eminence. Here are the gates of palaces, sculptured in marble; and lofty columns, also of marble. In the whole region of Syria there is not a more stupendous or considerable edifice than this[140]." The approach to this ruined city is thus described by Mr. Bruce:--"The form of Mount Libanus, as seen from the plain of Bekka, is this: first, a range of mountains, extremely proper for culture, and of no considerable height, sloping easily to the plain, and covered with trees that are not very thickly planted. On the other side of these rises a chain of mountains of an extraordinary height, bare for the most part, and stony, cut in every rain, and covered with snow, except in summer. Thus they continue till they descend much more steeply on the other side towards the sea. The valleys within this high chain of mountains, which on one side run parallel with the sea-coast, and on the other form the east side of the plain of Bekka, are mostly narrow; but abundantly fertile, were they in the hands of better people, under a better government; industry being here always followed by oppression." Mr. Carne describes his arrival thus:--"The sun set on the vast temple, and the mountains around it, with indescribable grandeur; the chain of Anti-Libanus, in front, was covered with snow; and the plain, wild and beautiful, stretched at its feet farther than the eye can reach: the pigeons, of many-coloured plumage, flew in clusters round the ruined walls, at whose feet were a variety of trees and flowers, amidst which ran a clear and rapid stream."