In the deep Mamertine prison, behind the Tabulary of the Forum, it was customary to put to death only political misdoers, and their bodies were then thrown down the Gemonian steps. 'Vixerunt,' said Cicero, grimly, when Catiline's fellow conspirators lay there dead; and perhaps the sword that was to fall upon his own neck was even then forged. The prison is still intact. The blood of Vercingetorix and of Sejanus is on the rocky floor. Men say that Saint Peter was imprisoned here. But because he was not of high degree Nero's executioners led him out across the Forum and over the Sublician bridge, up to the heights of Janiculum. He was then very old and weak, so that he could not carry his cross, as condemned men were made to do. When they had climbed more than half-way up the height, seeing that he could not walk much farther, they crucified him. He said that he was not worthy to suffer as the Lord had suffered, and begged them to plant his cross with the head downward in the deep yellow sand. The executioners did so. The Christians who had followed were not many, and they stood apart weeping. When he was dead, after much torment, and the sentinel soldier had gone away, they took the holy body, and carried it along the hillside, and buried it at night close against the long wall of Nero's circus, on the north side, near the place where they buried the martyrs killed daily by Nero's wild beasts and in other cruel ways. They marked the spot, and went there often to pray. Lately certain learned men have said that he was crucified in the circus itself, but the evidence is slight compared with the undoubted weight of a very ancient tradition, and turns upon the translation of a single word.