Other palaces were built later in Jerusalem, and Agrippa II. rebuilt the palace of the Hasmonæans,[279] which was in the north-east part of the upper city, near the great Tyropœon bridge and the Xystos. The latter Greek word signifies a covered gymnasium, and there is no reason to doubt that this building was the same as the gymnasium built by the high-priest Jason before 170 B. C., which is described as being “under the Acropolis” or upper city. It lay north of the bridge,[280] but its remains, and those of the neighbouring council-house, have not been identified with certainty. There were gates in the west wall of the Temple above it; and as these seem clearly to be the two central gates on that side, it must have been south of the ancient causeway, and down in the Tyropœon Valley. An “ancient hall” discovered by Sir Charles Warren, which he considers to be “one of the oldest buildings in Jerusalem,” may have some connection with either the Xystos or the council-house. It lies partly under the street leading to the Gate of the Chain, and measured about 23 feet by 20 feet; its floor is about on the level of the Herodian street pavement; its roof is less ancient than its walls; at each corner inside there are rude pilaster capitals of semi-Ionic character. The outer masonry is drafted and resembles that of Herod’s age. Herod assembled wrestlers and other athletes at his games every five years, but it is doubtful if his “theatre” was the same as the gymnasium; a “hippodrome” which lay towards the south of the Temple may, however, have been connected with the Xystos. It has been sought farther south by Mr. Bliss, but no remains of such a building were there found.[281] Some alterations seem to have occurred in the water-supply in consequence of the building of the west outer wall of Herod’s Temple, and these indicate that the wall is later than two rock-cut aqueducts which it cuts across. The southern one of these ran from the Pool of the Bath to Siloam, and has been traced in parts by Sir Charles Warren and Mr. Bliss. The second led from north-west to the Antonia fosse, where possibly the “Pool Strouthios”[282] was made by Herod when he rebuilt Antonia. This aqueduct merely served to collect the rain-water north of the city, and carried it originally to a rock tank which is included within Herod’s west sanctuary wall. The supply being thus cut off, the water of the aqueduct would serve to fill the Antonia fosse, or the Pool Strouthios in that fosse--known later as the “Twin Pools”--supposing that these were cut as early as Herod’s time. The great tunnel of this aqueduct under the Antonia rock stops dead at the Temple wall, and the only use that could afterwards be made of it would be as a secret exit, through the window which I discovered in this wall just south of the Antonia scarp. [Sidenote: THE TEMPLE BRIDGE]