Justin Martyr was an early Church Father and Chiliast. He had the opinion that the orthodox eschatology of the Church was Premillennial, even though he admitted other reasonably good Christians believed otherwise.
Dialogue with Trypho
CHAPTER LXXX -- THE OPINION OF JUSTIN WITH REGARD TO THE REIGN OF A THOUSAND YEARS. SEVERAL CATHOLICS REJECT IT.
And Trypho to this replied, "I remarked to you sir, that you are very anxious to be safe in all respects, since you cling to the Scriptures. But tell me, do you really admit that this place, Jerusalem, shall be rebuilt; and do you expect your people to be gathered together, and made joyful with Christ and the patriarchs, and the prophets, both the men of our nation, and other proselytes who joined them before your Christ came? or have you given way, and admitted this in order to have the appearance of worsting us in the controversies?"
Then I answered, "I am not so miserable a fellow, Trypho, as to say one thing and think another. I admitted to you formerly, that I and many others are of this opinion, and[believe] that such will take place, as you assuredly are aware; but, on the other hand, I signified to you that many who belong to the pure and pious faith, and are true Christians, think otherwise. Moreover, I pointed out to you that some who are called Christians, but are godless, impious heretics, teach doctrines that are in every way blasphemous, atheistical, and foolish. But that you may know that I do not say this before you alone, I shall draw up a statement, so far as I can, of all the arguments which have passed between us; in which I shall record myself as admitting the very same things which I admit to you. For I choose to follow not men or men's doctrines, but God and the doctrines[delivered] by Him. For if you have fallen in with some who are called Christians, but who do not admit this[truth], and venture to blaspheme the God of Abraham, and the God of Isaac, and the God of Jacob; who say there is no resurrection of the dead, and that their souls, when they die, are taken to heaven; do not imagine that they are Christians, even as one, if he would rightly consider it, would not admit that the Sadducees, or similar sects of Genist , Meristae,Gelilaeans, Hellenists, Pharisees, Baptists, are Jews(do not hear me impatiently when I tell you what I think), but are[only] called Jews and children of Abraham, worshipping God with the lips, as God Himself declared, but the heart was far from Him. But I and others, who are right-minded Christians on all points, are assured that there will be a resurrection of the dead, and a thousand years in Jerusalem, which will then be built, adorned, and enlarged, the prophets Ezekiel and Isaiah and others declare.
Here Justin describes his belief in the Millennium in which people live long lives, indicating they are mortal. Sinners are there because when they die before 100 they are considered cursed.
CHAPTER LXXXI -- HE ENDEAVOURS TO PROVE THIS OPINION FROM ISAIAH AND THE APOCALYPSE.
"For Isaiah spake thus concerning this space of a thousand years: 'For there shall be the new heaven and the new earth, and the former shall not be remembered, or come into their heart; but they shall find joy and gladness in it, which things I create. For, Behold, I make Jerusalem a rejoicing, and My people a joy; and I shall rejoice over Jerusalem, and be glad over My I people. And the voice of weeping shall be no more heard in her, or the voice of crying. And there shall be no more there a person of immature years, or an old man who shall not fulfil his days. For the young man shall be an hundred years old; but the sinner who dies an hundred years old, he shall be accursed. And they shall build houses, and shall themselves inhabit them; and they shall plant vines, and shall themselves eat the produce of them, and drink the wine. They shall not build, and others inhabit; they shall not plant, and others eat. For according to the days of the tree of life shall be the days of my people; the works of their toil shall abound. Mine elect shall not toil fruitlessly, or beget children to be cursed; for they shall be a seed righteous and blessed by the Lord, and their offspring with them. And it shall come to pass, that before they call I will hear; while they are still speaking, I shall say, What is it? Then shall the wolves and the lambs feed together, and the lion shall eat straw like the ox; but the serpent[shall eat] earth as bread. They shall not hurt or maltreat each other on the holy mountain, i saith the Lord.' Now we have understood that the expression used among these words, 'According to the days of the tree[of life] shall be the days of my people; the works of their toil shall abound' obscurely predicts a thousand years. For as Adam was told that in the nay fie ate of the tree he would die, we know that he did not complete a thousand years. We have perceived, moreover, that the expression, 'The day of the Lord is as a thousand years,' is connected with this subject. And further, there was a certain man with us, whose name was John, one of the apostles of Christ, who prophesied, by a revelation that was made to him, that those who believed in our Christ would dwell a thousand years in Jerusalem; and that thereafter the general, and, in short, the eternal resurrection and judgment of all men would likewise take place. Just as our Lord also said, 'They shall neither marry nor be given in marriage, but shall be equal to the angels, the children of the God of the resurrection.'
Put simply, Justin believed that even though other reasonably-good Christians believed otherwise, orthodox belief in his time belonged to those who believed in a literal Millennium. And this Millennial Age is populated by saints and sinners, ie by mortals, much as some Premillennialists like myself today believe.
Justin clearly downplayed the prominence of Israel in matters of salvation, and so downplayed their eschatological hope, as well, which I find unfortunate. However, Justin's burden here was to prove that Israel's race and nation were not the source of salvation for the world. The only Jew for whom the world should be concerned is Christ himself, through whom salvation comes both for the Jew and for the Gentile.
But here is indicated, clearly, that the Jews maintain a place in the salvation to be revealed at Christ's Return...
CHAPTER XXXII -- TRYPHO OBJECTING THAT CHRIST IS DESCRIBED AS GLORIOUS BY DANIEL, JUSTIN DISTINGUISHES TWO ADVENTS.
And when I had ceased, Trypho said, "These and such like Scriptures, sir, compel us to wait for Him who, as Son of man, receives from the Ancient of days the everlasting kingdom. But this so-called Christ of yours was dishonourable and inglorious, so much so that the last curse contained in the law of God fell on him, for he was crucified."
Then I replied to him, "If, sirs, it were not said by the Scriptures which I have already quoted, that His form was inglorious, and His generation not declared, and that for His death the rich would suffer death, and with His stripes we should be healed, and that He would be led away like a sheep; and if I had not explained that there would be two advents of His,--one in which He was pierced by you; a second, when you shall know Him whom you have pierced, and your tribes shall mourn, each tribe by itself, the women apart, and the men apart, --then I must have been speaking dubious and obscure things. But now, by means of the contents of those Scriptures esteemed holy and prophetic amongst you, I attempt to prove all [that I have adduced], in the hope that some one of you may be found to be of that remnant which has been left by the grace of the Lord of Sabaoth for the eternal salvation.
CHAPTER CXX. -- CHRISTIANS WERE PROMISED TO ISAAC, JACOB, AND JUDAH.
"Observe, too, how the same promises are made to Isaac and to Jacob. For thus He speaks to Isaac: 'And in thy seed shall all the nations of the earth be blessed.' And to Jacob: 'And in thee and in thy seed shall all families of the earth be blessed.' He says that neither to Esau nor to Reuben, nor to any other; only to those of whom the Christ should arise, according to the dispensation, through the Virgin Mary. But if you would consider the blessing of Judah, you would perceive what I say. For the seed is divided from Jacob, and comes down through Judah, and Phares, and Jesse, and David. And this was a symbol of the fact that some of your nation would be found children of Abraham, and found, too, in the lot of Christ.
CHAPTER CXXXVI -- THE JEWS, IN REJECTING CHRIST, REJECTED GOD WHO SENT HIM.
"For you see how He now addresses the people, saying a little before: 'As the grape shall be found in the cluster, and they will say, Destroy it not, for a blessing is in it; so will I do for My servant's sake: for His sake I will not destroy them all.' And thereafter He adds: 'And I shall bring forth the seed out of Jacob, and out of Judah.' It is plain then that if He thus be angry with them, and threaten to leave very few of them, He promises to bring forth certain others, who shall dwell in His mountain.
Here is an indication that Justin agrees with Paul that there remains at present a Jewish remnant chosen by grace. And he grants that they do have a place of inheritance in the land of Israel, or more specifically, in Jerusalem. However, the Jewish Prophets made a much bigger deal out of Israel's restoration, inasmuch as they were writing to Israel, and rendering them a model of grace for the world. Justin missed this, I believe.