Natalie Dormer is the first actor to be cast for season two of HBO’s exceptional medieval drama “Game of Thrones.”  The 29-year-old British starlet will play Margaery Tyrell, a woman from the influential House of Tyrell pledged to marry the late King Robert’s (Mark Addy) brother Renly Baratheon (Gethin Anthony).

Dormer, who stars in this summer’s Captain America, is best known for her portrayal of doomed queen Anne Boleyn on Showtime’s “The Tudors.” She was also cast in ABC’s failed pilot “Poe,” which re-imagined author Edgar Allan Poe as the world’s first detective.

HBO will host a “Game of Thrones” panel at Comic-Con on Thursday, July 21.  Scheduled to appear are Emilia Clarke, Jason Momoa, Peter Dinklage, Kit Harington and Nikolaj Coster-Waldau. “Game of Thrones” author—and show producer/writer—George R.R. Martin will serve as the panel’s moderator.

“Game of Thrones” season two will begin to shoot in late July.