Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[142] Now, of these three walls, the old one was hard to be taken, both by reason of the valleys, and of that hill on which it was built, and which was above them. But besides that great advantage, as to the place where they were situated, it was also built very strong; because David and Solomon, and the following kings, were very zealous about this work. Now that wall began on the north, at the tower called "Hippicus," and extended as far as the "Xistus," a place so called, and then, joining to the council-house, ended at the west cloister of the temple. But if we go the other way westward, it began at the same place, and extended through a place called "Bethso," to the gate of the Essens; and after that it went southward, having its bending above the fountain Siloam, where it also bends again towards the east at Solomon's pool, and reaches as far as a certain place which they called "Ophlas," where it was joined to the eastern cloister of the temple. The second wall took its beginning from that gate which they called "Gennath," which belonged to the first wall; it only encompassed the northern quarter of the city, and reached as far as the tower Antonia. The beginning of the third wall was at the tower Hippicus, whence it reached as far as the north quarter of the city, and the tower Psephinus, and then was so far extended till it came over against the monuments of Helena, which Helena was queen of Adiabene, the daughter of Izates; it then extended further to a great length, and passed by the sepulchral caverns of the kings, and bent again at the tower of the corner, at the monument which is called the "Monument of the Fuller," and joined to the old wall at the valley called the "Valley of Cedron." It was Agrippa who encompassed the parts added to the old city with this wall, which had been all naked before; for as the city grew more populous, it gradually crept beyond its old limits, and those parts of it that stood northward of the temple, and joined that hill to the city, made it considerably larger, and occasioned that hill, which is in number the fourth, and is called "Bezetha," to be inhabited also. It lies over against the tower Antonia, but is divided from it by a deep valley, which was dug on purpose, and that in order to hinder the foundations of the tower of Antonia from joining to this hill, and thereby affording an opportunity for getting to it with ease, and hindering the security that arose from its superior elevation; for which reason also that depth of the ditch made the elevation of the towers more remarkable. This new-built part of the city was called "Bezetha," in our language, which, if interpreted in the Grecian language, may be called "the New City." Since, therefore, its inhabitants stood in need of a covering, the father of the present king, and of the same name with him, Agrippa, began that wall we spoke of; but he left off building it when he had only laid the foundations, out of the fear he was in of Claudius Caesar, lest he should suspect that so strong a wall was built in order to make some innovation in public affairs; for the city could no way have been taken if that wall had been finished in the manner it was begun; as its parts were connected together by stones twenty cubits long, and ten cubits broad, which could never have been either easily undermined by any iron tools, or shaken by any engines. The wall was, however, ten cubits wide, and it would probably have had a height greater than that, had not his zeal who began it been hindered from exerting itself. After this, it was erected with great diligence by the Jews, as high as twenty cubits, above which it had battlements of two cubits, and turrets of three cubits altitude, insomuch that the entire altitude extended as far as twenty-five cubits.