Katerina Petrova (Bulgarian: Катерина Петрова; English: Katherine Pierce), is a fictional character from the hit TV series, The Vampire Diaries. Born June 5, 1473, Katherine is a doppelganger, descended from Amara and Tatia. She is an ex-vampire and the ex-lover to both the 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.