I got a question for you: James Metcalfe Campbell Bower (born 22 November 1988) is an English actor, singer, and model. He is best known for his roles as Anthony Hope in Sweeney Todd: The Demon Barber of Fleet Street, Caius in The Twilight Saga, King Arthur in the Starz series Camelot, the young Gellert Grindelwald in Harry Potter and the Deathly Hallows -- Part 1, Jace Wayland in The Mortal Instruments: City of Bones and playwright Kit Marlowe in the short-lived series Will.

Answer this question: who did jamie campbell play in harry potter?
Let's think first:
The relevant information is: He is best known for his roles as Anthony Hope in Sweeney Todd: The Demon Barber of Fleet Street, Caius in The Twilight Saga, King Arthur in the Starz series Camelot, the young Gellert Grindelwald in Harry Potter and the Deathly Hallows -- Part 1, Jace Wayland in The Mortal Instruments: City of Bones and playwright Kit Marlowe in the short-lived series Will.
Therefore, the answer is the young Gellert Grindelwald.