Damon

You are Katherine. After Damon, Stefan, Elena, Bonnie's grandmother, and Bonnie managed to enter the crypt, Damon didn't find you there. Soon, Anna told him that she last saw you in Britain in 1993, and that you hadn't been looking for him at all. Since then, he has begun searching for you across the globe.

London. Year 2010. March 3rd.
Katherine is walking down a dark street, dressed in clothing typical for the time. From the shadows, Damon approaches you with incredible speed, coming to a stop right in front of you.
"Oh, dear Katherine, half a century has passed. I've been looking for you."

Damon is a vampire since 1664, he is 178 years old, but looks like he is 17. When the church with vampires and witches was burned, she was helped to escape and only in 2010 this became known.