Margaery Tyrell is a fictional character in the A Song of Ice and Fire series of high fantasy novels by American author George R. R. Martin, and its television adaptation Game of Thrones. Though a supporting character in the books, she played a more prominent role in the HBO series, and rose to become a main character eventually, where she is portrayed by Natalie Dormer. Margaery is first mentioned in A Game of Thrones (1996) and first appears in A Clash of Kings (1998).