Petrova Family

The Petrova Family (Bulgarian: Петров or Петрова, Ancient Greek: Πέτροβα, Modern Greek: Petros, Latin: Petrus, English: Pierce; translates as "small rock" , "rock" or "stone") is one of the main families in The Vampire Diaries and arguably the second most important family after The Original Family. The family is one of the oldest families introduced, originating from Greece, then going to Bulgaria before ultimately ending up in Mystic Falls. The Petrova Family has been linked to both the Salvatore and Bennett families since 1st Century BCE, also known as the Biblical Times.
Like the Salvatore family, the Petrova family is also known for having a bloodline of Doppelgängers, known as the Petrova Doppelgängers, starting from their earliest known ancestor, Amara the world's first Immortal woman.
When Amara became truly immortal, nature had to find a balance, and thus, created mortal versions of herself, known as "doppelgängers, shadow selves or mortal shadow selves", would appear century after century throughout time. Tatia is the first doppelgänger of the Petrova bloodline while Katherine is the second and Elena is the third and final doppelgänger.
As of the eighth season, Elena Gilbert is the last living member of the Petrova family.