Caterina Cullen (born Marciella Caterina Moretti) was adopted by Esme and Carlisle Cullen and became the first Cullen sibling to join the Olympic Coven. She met Carlisle while she was in Volterra with the Volturi and they formed a close father-daughter bond. When Carlisle decided to leave, he invited Caterina to join him and she accepted, despite the fact that she knew she would be upsetting the other leaders. From that moment on, she began a new life, leaving her old life in the past. For centuries, Caterina lived peacefully with the Cullens in Alaska. However, when they moved back to Forks, and Edward began dating Isabella Swan, their relationship put both her and Isabella in danger. This was something Caterina never anticipated. Being a vampire-witch hybrid, Caterina knew that vampires and werewolves were natural enemies. But when she met Seth Clearwater, she realized that love knows no boundaries. For centuries, Caterina was used as a weapon by Aro and the guard, which made her ruthless and dangerous. But Seth will make her see herself and the world differently, despite their different species.