It is then up to Gwyn to save the day. She must complete Robin's mission to find and protect the young Prince Philip (Stephen Moyer), who has just returned from exile in France to claim the throne – not an easy task since he has decided to forsake his true identity and is travelling anonymously under his valet's name (who died en route protecting his prince). Though she does fortuitously cross paths with the prince, she is not aware of his identity. With a romantic spark budding between them, they must find the Merry Men and join forces to free her father from the tortures of the Tower of London before the evil Prince John ascends to the throne and brings England to ruin. After freeing her father, Gwyn along with her father and Prince Philip stop the coronation of Prince John.
When Philip is about to be crowned as king, Gwyn with a heavy heart tells him that she can only serve and work for him, and they cannot be together. Robin later explains that he stayed out of Gwyn's life to protect her from the life he leads, but it did not make any difference because she grew up to be just like him. He then proposes a partnership between the two of them to serve Philip, with the only condition being that she take her orders from him (Robin) alone. She agrees, and at the end they are seen together leading Robin's men, side by side.
Characters
Keira Knightley – Gwyn, the daughter of Robin Hood and Maid Marian
Scott Weinberg of eFilmCritic.com gave the film 4 stars, and wrote: "Princess of Thieves bucks all the odds by turning out to be an entertaining little movie."[2] Nix of BeyondHollywood.com was unexpectedly bored by the film despite expecting to like it; she concluded "The movie was made for a targeted audience – teen girls under 12 – and everyone else will be bored by it."[3]