<P> Born June 5, 1473, Katherine is the ultimate doppelgänger, descended from Amara and Tatia . She is an ex-vampire and the ex-lover to both Salvatore brothers, Damon and Stefan . She first appears as Katherine Pierce in recurring flashbacks to 1864, which feature her romantic entanglements with the Salvatore brothers . She managed to turn them both into vampires, but she was consequently captured by the townspeople of Mystic Falls to be killed in Fells Church where they planned to lock the vampires in before setting it alight . She later appears in present day . </P> <P> Behind her sweet - nature facade, a much more calculating side of Katherine is revealed through flashbacks in which she escaped certain death with the help of George Lockwood, (at the expense of all the other vampires in town) in 1864 . After 145 years, Katherine returns to Mystic Falls, toying with the Salvatores again and has a hidden agenda . Katherine earns no love after she turns Caroline Forbes into a vampire and uses a werewolf, Mason Lockwood, to retrieve a mysterious moonstone . Eventually she is exposed as a doppelgänger who has spent her immortal life fleeing from an Original vampire / werewolf hybrid, named Klaus aka (Niklaus Mikaelson). </P> <P> During Katherine's five centuries of life she became one of the most ruthless, notorious and infamous vampires in history . Katherine promises John Gilbert that she will help protect her descendant Elena Gilbert, even though the younger doppelgänger is her competition for the Salvatores' affections . She is initially portrayed as the main antagonist, but upon the arrival of Elijah, one of the Original vampires, Katherine is clearly terrified by the prospect of finally being caught by Klaus . Once she escapes at the end of the second season, she flees Mystic Falls almost immediately . Later returning to Mystic Falls in season 4; killing Elena's brother Jeremy Gilbert, to acquire a cure for vampirism while trying to negotiate a deal with Klaus for her freedom . This however; backfires on her, when Elena shoves the cure into her mouth during a fight, turning her human . Over the next season Katherine finds her long lost daughter, Nadia Petrova . Katherine's body is over 500 years and can't hold up to her being human . So, together Katherine and Nadia decide to plant Katherine's soul into Elena's body, but once Elena's friends discover this, she is stabbed to be extracted from Elena's body and she dies beside her daughter who dies just moments earlier from a hybrid bite . </P> <P> Katerina Petrova (Bulgarian: Катерина Петрова) was born into a wealthy Bulgarian family on June 5, 1473 . In 1490, a very young Katerina became pregnant by an unknown man . She carried the child to term; but seconds after her daughter's birth, Katerina's father took the child away . He claimed it would be better for both of them to never see one another and consequently her family disowned her for the shameful birth of an illegitimate daughter . At this time it seemed to be a devastating "punishment" to her crime . </P>

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