St. Gregory the Dialogist and Emperor Trajan

In the time that Trajan the emperor reigned, and on a time as he went toward a battle out of Rome, it happed that in his way as he should ride, a woman, a widow, came to him weeping and said I pray thee, sire, that thou avenge the death of one my son which innocently and without cause hath been slain. The emperor answered: If I come again from the battle whole and sound then I shall do justice for the death of thy son. Then said the widow: Sire, and if thou die in the battle who shall then avenge his death? And the emperor said: He that shall come after me. And the widow said: Is it not better that thou do to me justice and have the merit thereof of God than another have it for thee? Then had Trajan pity and descended from his horse and did justice in avenging the death of her son. On a time Saint Gregory went by the market of Rome which is called the market of Trajan, and then he remembered of the justice and other good deeds of Trajan, and how he had been piteous and debonair, and was much sorrowful that he had been a pagan, and he turned to the church of Saint Peter wailing for the horror of the miscreance of Trajan. Then answered a voice from God saying: I have now heard thy prayer, and have spared Trajan from the pain perpetual. By this, as some say, the pain perpetual due to Trajan as a miscreant was some deal taken away, but for all that was not he quit from the prison of hell, for the soul may well be in hell and feel there no pain by the mercy of God. (The Life of St. Gregory the Pope)