The Silmarillion

All have their worth,’ said Yavanna, ‘and each contributes to the worth of the others.

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.

but the Stones were

Now these were the Three that had last been made, and they possessed the greatest powers. Narya, Nenya, and Vilya, they were named, the Rings of Fire, and of Water, and of Air, set with ruby and adamant and sapphire; and of all the Elven-rings Sauron most desired to possess them, for those who had them in their keeping could ward off the decays of time and postpone the weariness of the world.

Minas Ithil, the Tower of the Rising Moon, eastward upon a shoulder of the Mountains of Shadow as a threat to Mordor; and to the westward Minas Anor, the Tower of the Setting Sun, at the feet of Mount Mindolluin, as a shield against the wild men of the dales. In Minas Ithil was the house of Isildur, and in Minas Anor the house of Anárion, but they shared the realm between them and their thrones were set side by side in the Great Hall of Osgiliath. These were the chief dwellings of the Númenóreans in Gondor, but other works marvellous and strong they built in the land in the days of their power, at the Argonath, and at Aglarond, and at Erech; and in the circle of Angrenost, which Men called Isengard, they made the Pinnacle of Orthanc of unbreakable stone.

Therefore ere the Third Age was ended the Elves perceived that the Ring of Sapphire was with Elrond, in the fair valley of Rivendell, upon whose house the stars of heaven most brightly shone; whereas the Ring of Adamant was in the Land of Lórien where dwelt the Lady Galadriel. A queen she was of the woodland Elves, the wife of Celeborn of Doriath, yet she herself was of the Noldor and remembered the Day before days in Valinor, and she was the mightiest and fairest of all the Elves that remained in Middle-earth. But the Red Ring remained hidden until the end, and none save Elrond and Galadriel and Círdan knew to whom it had been committed.

Even as the first shadows were felt in Mirkwood there appeared in the west of Middle-earth the Istari, whom Men called the Wizards. None knew at that time whence they were, save Círdan of the Havens, and only to Elrond and to Galadriel did he reveal that they came over the Sea. But afterwards it was said among the Elves that they were messengers sent by the Lords of the West to contest the power of Sauron, if he should arise again, and to move Elves and Men and all living things of good will to valiant deeds. In the likeness of Men they appeared, old but vigorous, and they changed little with the years, and aged but slowly, though great cares lay on them; great wisdom they had, and many powers of mind and hand.

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,

Radagast was the friend of all beasts and birds; but Curunír went most among Men, and he was subtle in speech and skilled in all the devices of smithcraft. Mithrandir was closest in counsel with Elrond and the Elves. He wandered far in the North and West and made never in any land any lasting abode; but Curunír journeyed into the East, and when he returned he dwelt at Orthanc in the Ring of Isengard, which the Númenóreans made in the days of their power.

Galadriel indeed had wished that Mithrandir should be the head of the Council, and Saruman begrudged them that, for his pride and desire of mastery was grown great; but Mithrandir refused the office, since he would have no ties and no allegiance, save to those who sent him, and he would abide in no place nor be subject to any summons. But Saruman now began to study the lore of the Rings of Power, their making and their history.