Nina Dobrev as Katherine Pierce
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The young vampire whom Damon and Stefan both fell in love with when they were humans during the Italian Renaissance. Katherine turned the two brothers into vampires in an attempt to be happy with both brothers, instead of having to choose between them. When this didn't work she stage her 'suicide'. Katherine supposedly killed herself by going into the sunlight without her lapis lazuli ring, leaving behind a pile of ashes in one of her dresses. The two brothers fought to the 'death' because of her loss. She physically resembles Elena which caused Stefan's initial attraction to Elena, though he later realized that Elena was emotionally stronger then Katherine, who was docile and gentle as was the standard in Renaissance Italy. She turns out to be the Other Power that was damaging the town and was killed by Elena.