This is Melkarië. She is later called Isilmë and is the main character of a story I have written, based on the books of JRR Tolkien. Melkarië is Isilmë in the days she was still evil. The name is given to her by Melkor, the evil Vala and predecessor of Sauron. He saved her life to use her against her own kin. Something that will not work, for Melkarië becomes good and escapes Angband.