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.
Luthien and Morgoth. Lúthien offered to sing for Morgoth and filled with an evil lust for her he accepted. But when she began to sing Morgoth and his entire court fell into deep sleep. After this she sprang into the air and placed her cloak over Morgoth's eyes, shielding Beren and herself from him. She awoke Beren and after he had thrown away his disguise he cut a Silmaril from Morgoth's crown using Angrist.