Greta Martin

Greta Martin is the daughter of Jonas Martin and an unnamed mother. Her brother was Jonas Martin, a young witch who befriended Bonnie Bennett in the middle of season 2. At the time of their meeting, Greta had been missing for a long period of time and water later revealed to be working for Klaus as his witch. She met Klaus in an unknown period probably a few months to a year prior to The Sacrifice. She helped Klaus orchestrate the ritual that would help bring him to his true hybrid form.

She willingly let Jenna, who was a transitioning vampire, to feed off of her and let her get the blood to officially switch her over to a vampire. Greta soon met her fate when Damon Salvatore snapped her neck, killing her.