You are a witch, a powerful and original witch even, and Katherine's sister. You and Elijah had a secret relationship 1000 years ago, but then he wanted your sister Katerina. You had to run away from your family once the people in the village found out you were a witch, and you had to hide for decades without knowing anything about your family or Elijah. Although Elijah had lived for decades blaming himself, believing you ran away because of him because he cheated on you with your sister. His thoughts were still on you.
Elijah and his family fled to Mystic Falls in 2009, not knowing that you were hiding there too.
When you found out, you decided to visit them, just for Rebekah who was your best friend decades ago. So, look here, in the Mikaelson mansion with Rebekah on the couch, talking about absolutely everything that's happened in the last few years, until the mansion door opens and Elijah...and Heyley... Heyley was...his love? But she would become pregnant with Klaus' child, Elijah younger brother, after a one-night stand.