Lactantius,
Epitome of the Divine Institutes, chapter 70
(apparantly a different book from the Divine Institutes)

. . . Since fixed and divinely appointed times have begun to be filled up, a destruction and consummation of al

l things must of necessity take place, that the world may be renewed by God. But that time is at hand, as far as may be collected from the number of years, and from the signs which are foretold by the prophets. But since the things which have been spoken concerning the end of the world and the conclusion of the times are innumerable, those very things which are spoken are to be laid down without adornment, since it would be a boundless task to bring forward the testimonies. If any one wishes for them, or does not place full confidence in us, let him approach to the very shrine of the heavenly letters, and being more fully instructed through their trustworthiness, let him perceive that the philosophers have erred, who thought either that this world was eternal, or that there would be numberless thousands of years from the time when it was prepared. For six thousand years have not yet been completed, and when this number shall be made up, then at length all evil will be taken away, that justice alone may reign. And how this will come to pass, I will explain in few words.

Chapter 71
. . .
Then there will be a dreadful and detestable time, in which no one would choose to live. In fine, such will be the condition of things, that lamentation will follow the living, and congratulation the dead. Cities and towns will be destroyed, at one time by fire and the sword, at another by repeated earthquakes; now by inundation of waters, now by pestilence and famine. The earth will produce nothing, being barren either through excessive cold or heat. All water will be partly changed into blood, partly vitiated by bitterness, so that none of it can be useful for food, or wholesome for drinking. To these evils will also be added prodigies from heaven, that nothing may be wanting to men for causing fear. Comets will frequently appear. The sun will be overshadowed with perpetual paleness. The moon will be stained with blood, nor will it repair the losses of its light taken away. All the stars will fall, nor will the seasons preserve their regularity, winter and summer being confused. Then both the year, and the month, and the day will be shortened. And Trismegistus has declared that this is the old age and decline of the world. And when this shall have come, it must be known that the time is at hand in which God will return to change the world. But in the midst of these evils there will arise an impious king, hostile not only to mankind, but also to God. He will trample upon, torment, harass and put to death those who have been spared by that former tyrant. Then there will be ever-flowing tears, perpetual wailings and lamentations, and useless prayers to God; there will be no rest from fear, no sleep for a respite. The day will always increase disaster, the night alarm. Thus the world will be reduced almost to solitude, certainly to fewness of men. Then also the impious man will persecute the just and those who are dedicated to God, and will give orders that he himself shall be worshipped as God. For he will say that he is Christ, though he will be His adversary. That he may be believed, he will receive the power of doing wonders, so that fire may descend from heaven, the sun retire from his course, and the image which he shall have set up may speak. And by these prodigies he shall entice many to worship him, and to receive his sign in their hand or forehead. And he who shall not worship him and receive his sign will die with refined tortures. Thus he will destroy nearly two parts, the third will flee into desolate solitudes. But he, frantic and raging with implacable anger, will lead an army and besiege the mountain to which the righteous shall have fled. And when they shall see themselves besieged, they will implore the aid of God with a loud voice, and God shall hear them, and shall send to them a deliverer.

CHAPTER 72 -- OF CHRIST DESCENDING FROM HEAVEN TO THE GENERAL JUDGMENT, AND OF THE MILLENARIAN REIGN.

Then the heaven shall be opened in a tempest, and Christ shall descend with great power, and there shall go before Him a fiery brightness and a countless host of angels, and all that multitude of the wicked shall be destroyed, and torrents of blood shall flow, and the leader himself shall escape, and having often renewed his army, shall for the fourth time engage in battle, in which, being taken, with all the other tyrants, he shall be delivered up to be burnt. But the prince also of the demons himself, the author and contriver of evils, being bound with fiery chains, shall be imprisoned, that the world may receive peace, and the earth, harassed through so many years, may rest. Therefore peace being made, and every evil suppressed, that righteous King and Conqueror will institute a great judgment on the earth respecting the living and the dead, and will deliver all the nations into subjection to the righteous who are alive, and will raise the righteous dead to eternal life, and will Himself reign with them on the earth, and will build the holy city, and this kingdom of the righteous shall be for a thousand years. Throughout that time the stars shall be more brilliant, and the brightness of the sun shall be increased, and the moon shall not be subject to decrease. Then the rain of blessing shall descend from God at morning and evening, and the earth shall bring forth all her fruit without the labour of men. Honey shall drop from rocks, fountains of milk and wine shall abound. The beasts shall lay aside their ferocity and become mild, the wolf shall roam among the flocks without doing harm, the calf shall feed with the lion, the dove shall be united with the hawk, the serpent shall have no poison; no animal shall live by bloodshed. For God shall supply to all abundant and harmless food. But when the thousand years shall be fulfilled, and the prince of the demons loosed, the nations will rebel against the righteous, and an innumerable multitude will come to storm the city of the saints. Then the last judgment of God will come to pass against the nations. For He will shake the earth froth its foundations, and the cities shall be overthrown, and He Shall rain upon the wicked fire with brimstone and hail, and they shall be on fire, and slay each other. But the righteous shall for a little space be concealed under the earth, until the destruction of the nations is accomplished, and after the third day they shall come forth, and see the plains covered with carcases. Then there shall be an earthquake, and the mountains shall be rent, and valleys shall sink down to a profound depth, and into this the bodies of the dead shall be heaped together, and its name shall be called Polyandrion. After these things God will renew the world, and transform the righteous into the forms of angels, that, being presented with the garment of immortality, they may serve God for ever; and this will be the kingdom of God, which shall have no end. Then also the wicked shall rise again, not to life but to punishment; for God shall raise these also, when the second resurrection takes place, that, being condemned to eternal torments and delivered to eternal fires, they may suffer the punishments which they deserve for their crimes.

CHAPTER 73 -- THE HOPE OF SAFETY IS IN THE RELIGION AND WORSHIP OF GOD.

Wherefore, since all these things arc true and certain, in harmony with the predicted announcement of the prophets, since Trismegistus and Hystaspes and the Sibyls have foretold the same things, it cannot be doubted that all hope of life and salvation is placed in the religion of God alone. Therefore, unless a man shall have received Christ, whom God has sent, and is about to send for our redemption, unless he shall have known the Supreme God through Christ, unless he shall have kept His commandments and law, he will fall into those punishments of which we have spoken. Therefore frail things must be despised, that we may gain those which are substantial; earthly things must be scorned, that we may be honoured with heavenly things; temporal things must be shunned, that we may reach those which are eternal. Let every one train himself to justice, mould himself to self-restraint, prepare himself for the contest, equip himself for virtue, that if by any chance an adversary shall wage war, he may be driven from that which is upright and good by no force, no terror, and no tortures, may give, himself up to no senseless fictions, but in his uprightness acknowledge the true and only God, may cast away pleasures, by the attractions of which the lofty soul is depressed to the earth, may hold fast innocency, may be of service to as many as possible, may gain for himself incorruptible treasures by good works, that he may be able, with God for his judge, to gain for the merits of his virtue either the crown of faith, or the reward of immortality.