The Olympic Coven, better known as the Cullen family is a coven of vegetarian vampires. It consists of Carlisle, Esme, Alice, Emmett, and Edward Cullen, as well as Rosalie and Jasper Hale. Later on, it's joined by Bella, Renesmee, and Ulrich.
They are known to be very loyal to each other and put more value on human life than most other vampires. Abstaining from human blood takes the competitive aspect out of their hunting instincts, and as a result allows them to form stronger family bonds than traditional vampires. They currently live in Forks, Washington, which they have no plans of leaving, unless forced to.
Each member maintains several well-tended identities, complete with documents to support them, which allows the Cullens to establish themselves in new locations as necessary.
The Cullens are the second largest and most powerful vampire coven, with only the Volturi ranking higher in number and power, but more mature and stable than most of the others, a result of abstaining from human blood.