Every dwelling was, therefore, in some sense, a temple of Vesta; but there was also in each city a stately edifice where all the citizens worshiped at her sacred fire, and were thus bound together in one great family. In Rome, where the worship of Vesta was most celebrated, a beautiful circular temple, dedicated to the goddess, stood in the Forum. It was not necessary to place a statue of Vesta here, for the eternal fire that glowed on her altar was her living symbol, and through this she was worshiped. This fire was supposed to have been brought to Italy by Æneas when he fled from burning Troy and carried with him out of the city two valuable possessions, _i.e._ the fire of Vesta and his own household gods--or Penates. When a colony was sent out from any city, the emigrants took some of the fire from the temple of Vesta in the mother town, and guarded it during their voyages, that they might use its flames to light the fires that were to burn on the hearths of the new homes. Each city cherished carefully the fire that was sacred to Vesta, and never allowed it to burn out, for that was an evil omen sure to presage disaster. If by any chance it was allowed to become extinct, it was never relit from any ordinary fire, but was kindled with a spark produced by friction, or by drawing fire from the sun's rays through a glass. The temple at Rome was the most famous of those dedicated to Vesta, for here was the school of the Vestal Virgins whose duty it was to tend her ever-living fire. As any neglect on their part might bring some public calamity upon Rome, this altar was jealously guarded; and when, as it sometimes happened, enemies threatened the city, the Vestals carried the fire of Vesta down the Tiber and kept it in concealment until the danger was over. Since so much depended on the watchfulness and fidelity of the Vestals, the office of priestess to the temple was held in high honor, and the maidens were chosen from the noblest families of Rome. They entered the service at the very youthful age of six, and spent thirty years in the temple. The first ten years were devoted to learning their important duties; the next decade was the period for filling the office of priestess, and performing all the solemn rites that belonged to the worship of Vesta; the last ten years were given to instructing the novices. When the thirty years of service were over, the Vestals could continue in the temple, or leave it and marry if they desired; but so holy were the Virgins thought to become through their long residence in the temple, that it was held a sort of sacrilege for any man to marry them. Therefore the priestesses usually died, as they had lived, in the service of the goddess.