"And we love them: tall men and fair women, valiant both alike, golden-haired, bright-eyed, and strong; they remind us of the youth of Men, as they were in the Elder Days. Indeed it is said that they have from old this affinity with us that they are come from the same Three Houses of Men as were the Numenoreans in their beginning; not from Hador the Goldenhaired, the Elf-friend, yet from such of his people that went not over the Sea into the West, refusing the call." - Faramir, about…
In the earliest of days, before the Valar entered Arda, Sauron was originally known as Mairon the Admirable, a powerful Maia of Aule the Smith, a Vala. However, Mairon was soon corrupted by the Dark Lord Morgoth an evil Vala and Dark Enemy of Arda, and turned evil, taking the name, “Sauron.” At first, he was a spy for Morgoth, telling him the Valar’s doings.
"You speak of high things," Gwindor asnswered, "and plain is it that you have lived among the Eldar. But a darkness is on you if you set Morgoth and Manwe together, or speak of the Valar as foes of Elves and Men; for the Valar scorn nothing, least of all the Children of Illuvatar. It is a prophecy among us that one day a messenger from Middle Earth will come through the shadows to Valinor, and Manwe will hear and Mandos relent."
Eagles and dwarves
Aule Creating the Dwarves Desperate for pupils onto whom he could pass his knowledge and unwilling to wait for the emergence of the Children of Ilúvatar, Aulë created his own race of beings, the Dwarves. However, he did not have a clear idea of what the Children of Ilúvatar would be like, and because of the presence of the chaos caused by Melkor, Aulë made the Dwarves strong and unyielding, and not willing to endure the domination of others.
Melian & Thingol The Girdle also protected Doriath from the dark influence and prying eyes of Morgoth, similar to the way Galadriel used Nenya to protect Lothlórien from Sauron. Only those permitted by Thingol or Melian, or with power greater than Melian, could successfully navigate through it. The only recorded two to have passed through against her will were Beren and Carcharoth.