To whom the word of the LORD came in the days of Josiah the son of Amon king of Judah, in the thirteenth year of his reign.
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Augustine of Hippo
Jeremiah, like Isaiah, is one of the major prophets, not of the minor, like the others from whose writings I have just given extracts. He prophesied when Josiah reigned in Jerusalem and Ancus Martius at Rome, when the captivity of the Jews was already at hand; and he continued to prophesy down to the fifth month of the captivity, as we find from his writings. Zephaniah, one of the minor prophets, is put along with him, because he himself says that he prophesied in the days of Josiah; but he does not say till when. Jeremiah thus prophesied not only in the times of Ancus Martius but also in those of Tarquinius Priscus, whom the Romans had for their fifth king. For he had already begun to reign when that captivity took place. - "City of God 18.33"