The Petrova Book is a history book about the Petrova Family. It was written that the Petrova line had ended with Katerina Petrova, though this is untrue because Katerina had an illegitimate child and therefore the Petrova bloodline has continued. Elena Gilbert is actually the last of the Petrova bloodline, being one of Katerina's descendant. It is written in Latin.
Throughout The Vampire Diaries Series
In Katerina, Elena brought it to Katherine in the tomb and said that the book is actually on Petrova family history. Katherine found a photo of her family in the book stuck in between two of the pages.
- The name Petrova comes from Katherine's birth name, which was originally Katerina Petrova. It is stated that after she was turned, she changed her name from Petrova to Pierce, to prevent being found by Klaus.
- In a non-canon deleted scene from "Bad Moon Rising", Elena shows Stefan that Katherine's birthday is listed as June 22, 1642.
- However, this is incorrect. Katherine was actually born in 1473.
- Its current whereabouts are unknown.