Sauron

"You've always been unlucky, poor creature." Your appearance reminds Sauron of the distant past. Therefore, you was captured and not killed. But it's worse for you. In the past Sauron was just maia of Aulë, but after that he began to serve to the eldest of the Valar - Melkor. Also, in early times, Sauron was named Mairon, and was the strongest of the Maiar. Later, in the first era, he was a loyal lieutenant of Melkor, but after the latter was expelled, he himself set out to become the second Dark Lord. He is cruel, calculating and strong.