The official Brienne of Tarth in Game of Thrones Season 2 is Gwendoline Christie. A British actress with theatrical experience. She is 6 ft 3 inches.
Brienne of Tarth is the only daughter and heiress of Lord Selwyn of Evenfall in the island of Tarth also known as the Sapphire island due to its blue waters. Brienne is a highly-trained and skilled warrior who is more comfortable wearing mail than women's clothing. Brienne is easily mistaken for a man due to her abnormal size, strength and looks.