Years of the Trees

The Years of the Trees, also called the Days of Bliss (of Valinor) or the Noontide of Valinor, were the long years that lay between the founding of Valinor and its Darkening. During this time, Valinor was lit by the light of the Two Trees, but Middle-earth lay in the Great Darkness.
The Years of the Trees preceded the Years of the Sun, and perhaps belonged to, or at least overlapped with, the First Age.
== History ==
Long before the Elves awoke, Yavanna created the Two Trees of Valinor to give light to realm of the Valar. The Trees first flowered after 3500 Valian Years (i.e. nearly 35,000 ordinary years) had passed. This period began at the Opening Hour, when Telperion first started to bloom alone; on the second hour, the First Day begun, and with it, the beginning of the Count of Time.
So began a reign of peace in Valinor, but Middle-earth was lit by starlight alone, and Melkor worked in the depths of Utumno in the north of the World and its dominion expanded to the south, while Sauron was appointed lieutenant in Angband, anticipating an assault from the West. It is not told how long this time lasted, just that 'the ages drew on'; this period would have lasted roughly 10,500 years. It was during this period that Aulë made the Dwarves, and at Eru's direction, set them to sleep until the creation of the stars and the Awakening of the Elves.
When Oromë discovered that the Elves had awoken at Cuiviénen, great changes came about. The Valar began the Battle of the Powers against Melkor; Utumno was destroyed and Melkor brought in chains to Valinor. The Valar also summoned the Elves to dwell in their land, and many answered this summons.
A period of three ages (about 2,900 years) followed. Melkor was imprisoned in the Halls of Mandos, and the Valar and Eldar dwelt together in the light of the Trees. In the darkness of Middle-earth, the Dark Elves who had not journeyed to Valinor still dwelt, and the Fathers of the Dwarves stirred. Men would not appear until some time after the end of the Years of the Trees.
These Years came to an end when Manwë released Melkor from his imprisonment. For a time, the Dark Lord pretended friendship with the Eldar, but he turned back to the darkness. After shining for 1495 Valian Years, they were destroyed by Ungoliant. During the Long Night, they stole the Silmarils and fled back to the north of Middle-earth. Seeking revenge, Fëanor led a great part of the Noldor out of Valinor and back to Beleriand.