Lydia Mikaelson was turned into a vampire by her mother like the rest of her siblings. In 1492, after Katerina fled with the moonstone, she was daggered by Klaus. 519 years later, she is awakened by the Salvatores who hope she'll help them kill her brother. Seeking revenge on Klaus for what he's done, she agrees. But in the middle of seeking revenge, Lydia finds love too. Damon/OC