It is said that the towers of Emyn Beraid were not built indeed by the Exiles of Númenor, but were raised by Gil-galad for Elendil, his friend; and the Seeing Stone of Emyn Beraid was set in Elostirion, the tallest of the towers. Thither Elendil would repair, and thence he would gaze out over the sundering seas, when the yearning of exile was upon him; and it is believed that thus he would at whiles see far away even the Tower of Avallónë upon Eressëa, where the Masterstone abode, and yet abides. These stones were gifts of the Eldar to Amandil, father of Elendil, for the comfort of the Faithful of Númenor in their dark days, when the Elves might come no longer to that land under the shadow of Sauron. They were called the Palantíri, those that watch from afar; but all those that were brought to Middle-earth long ago were lost.

Thus the Exiles of Númenor established their realms in Arnor and in Gondor; but ere many years had passed it became manifest that their enemy, Sauron, had also returned. He came in secret, as has been told, to his ancient kingdom of Mordor beyond the Ephel Dúath, the Mountains of Shadow, and that country marched with Gondor upon the east. There above the valley of Gorgoroth was built his fortress vast and strong, Barad-dûr, the Dark Tower; and there was a fiery mountain in that land that the Elves named Orodruin. Indeed for that reason Sauron had set there his dwelling long before, for he used the fire that welled there from the heart of the earth in his sorceries and in his forging; and in the midst of the Land of Mordor he had fashioned the Ruling Ring. There now he brooded in the dark, until he had wrought for himself a new shape; and it was terrible, for his fair semblance had departed for ever when he was cast into the abyss at the drowning of Númenor. He took up again the great Ring and clothed himself in power; and the malice of the Eye of Sauron few even of the great among Elves and Men could endure.

Now Sauron prepared war against the Eldar and the Men of Westernesse, and the fires of the Mountain were wakened again. Wherefore seeing the smoke of Orodruin from afar, and perceiving that Sauron had returned, the Númenóreans named that mountain anew Amon Amarth, which is Mount Doom. And Sauron gathered to him great strength of his servants out of the east and the south; and among them were not a few of the high race of Númenor. For in the days of the sojourn of Sauron in that land the hearts of well nigh all its people had been turned towards darkness. Therefore many of those who sailed east in that time and made fortresses and dwellings upon the coasts were already bent to his will, and they served him still gladly in Middle-earth. But because of the power of Gil-galad these renegades, lords both mighty and evil, for the most part took up their abodes in the southlands far away; yet two there were, Herumor and Fuinur, who rose to power among the Haradrim, a great and cruel people that dwelt in the wide lands south of Mordor beyond the mouths of Anduin.

When therefore Sauron saw his time he came with great force against the new realm of Gondor, and he took Minas Ithil, and he destroyed the White Tree of Isildur that grew there. But Isildur escaped, and taking with him a seedling of the Tree he went with his wife and his sons by ship down the River, and they sailed from the mouths of Anduin seeking Elendil. Meanwhile Anárion held Osgiliath against the Enemy, and for that time drove him back to the mountains; but Sauron gathered his strength again, and Anárion knew that unless help should come his kingdom would not long stand.

Now Elendil and Gil-galad took counsel together, for they perceived that Sauron would grow too strong and would overcome all his enemies one by one, if they did not unite against him. Therefore they made that League which is called the Last Alliance, and they marched east into Middle-earth gathering a great host of Elves and Men; and they halted for a while at Imladris. It is said that the host that was there assembled was fairer and more splendid in arms than any that has since been seen in Middle-earth, and none greater has been mustered since the host of the Valar went against Thangorodrim.

From Imladris they crossed the Misty Mountains by many passes and marched down the River Anduin, and so came at last upon the host of Sauron on Dagorlad, the Battle Plain, which lies before the gate of the Black Land. All living things were divided in that day, and some of every kind, even of beasts and birds, were found in either host, save the Elves only. They alone were undivided and followed Gil-galad. Of the Dwarves few fought upon either side; but the kindred of Durin of Moria fought against Sauron.

The host of Gil-galad and Elendil had the victory, for the might of the Elves was still great in those days, and the Númenóreans were strong and tall, and terrible in their wrath. Against Aeglos the spear of Gil-galad none could stand; and the sword of Elendil filled Orcs and Men with fear, for it shone with the light of the sun and of the moon, and it was named Narsil.

Then Gil-galad and Elendil passed into Mordor and encompassed the stronghold of Sauron; and they laid siege to it for seven years, and suffered grievous loss by fire and by the darts and bolts of the Enemy, and Sauron sent many sorties against them. There in the valley of Gorgoroth Anárion son of Elendil was slain, and many others. But at the last the siege was so strait that Sauron himself came forth; and he wrestled with Gil-galad and Elendil, and they both were slain, and the sword of Elendil broke under him as he fell. But Sauron also was thrown down, and with the hilt-shard of Narsil Isildur cut the Ruling Ring from the hand of Sauron and took it for his own. Then Sauron was for that time vanquished, and he forsook his body, and his spirit fled far away and hid in waste places; and he took no visible shape again for many long years.

Thus began the Third Age of the World, after the Eldest Days and the Black Years; and there was still hope in that time and the memory of mirth, and for long the White Tree of the Eldar flowered in the courts of the Kings of Men, for the seedling which he had saved Isildur planted in the citadel of Anor in memory of his brother, ere he departed from Gondor. The servants of Sauron were routed and dispersed, yet they were not wholly destroyed; and though many Men turned now from evil and became subject to the heirs of Elendil, yet many more remembered Sauron in their hearts and hated the kingdoms of the West. The Dark Tower was levelled to the ground, yet its foundations remained, and it was not forgotten. The Númenóreans indeed set a guard upon the land of Mordor, but none dared dwell there because of the terror of the memory of Sauron, and because of the Mountain of Fire that stood nigh to Barad-dûr; and the valley of Gorgoroth was filled with ash. Many of the Elves and many of the Númenóreans and of Men who were their allies had perished in the Battle and the Siege; and Elendil the Tall and Gil-galad the High King were no more. Never again was such a host assembled, nor was there any such league of Elves and Men; for after Elendil’s day the two kindreds became estranged.

The Ruling Ring passed out of the knowledge even of the Wise in that age; yet it was not unmade. For Isildur would not surrender it to Elrond and Círdan who stood by. They counselled him to cast it into the fire of Orodruin nigh at hand, in which it had been forged, so that it should perish, and the power of Sauron be for ever diminished, and he should remain only as a shadow of malice in the wilderness. But Isildur refused this counsel, saying: ‘This I will have as were-gild for my father's death, and my brothers. Was it not I that dealt the Enemy his death-blow?' And the Ring that he held seemed to him exceedingly fair to look on; and he would not suffer it to be destroyed. Taking it therefore he returned at first to Minas Anor, and there planted the White Tree in memory of his brother Anárion. But soon he departed, and after he had given counsel to Meneldil, his brother's son, and had committed to him the realm of the south, he bore away the Ring, to be an heirloom of his house, and marched north from Gondor by the way that Elendil had come; and he forsook the South Kingdom, for he purposed to take up his father's realm in Eriador, far from the shadow of the Black Land.