The Girl of Fire and Thorns : Fire and Thorns bk. 1
(Book)

Once a century, one person is chosen for greatness. Elisa is the chosen one. But she has always felt powerless, useless. Now, on her sixteenth birthday, she has become the secret wife of a handsome and worldly king-a king whose country is in turmoil. A king who needs her to be the chosen one, not a failure of a princess. And he's not the only one who seeks her. Fierce enemies, seething with dark magic, are hunting her. A daring, determined revolutionary thinks she could be his people's savior. Soon it is not just her life, but her very heart that is at stake. Elisa could be everything to those who need her most. If the prophecy is fulfilled. If she finds the power deep within herself. If she doesn't die young. Most of the chosen do.