From A Wiki of Ice and Fire
|Played by||Noah Taylor|
|TV series||Season 3|
Locke is a a bannerman of Roose Boltonter who is his best hunter. He only appeared in the TV series and is played by Noah Taylor. His character was created specifically for the TV series, he replaces a character Vargo Hoat from the books as George R. R. Martin requested the name change, when the producers eliminated the lisping and sobering as being too over the top, as the character not being Vargo Hoat. He may be member of House Locke.
Game of Thrones
Locke is dispatched by his Roose Bolton to hunt down Jaime Lannister. He and his men soon track the Kingslayer with his escort Brienne of Tarth down, and take them into custody, along with his escort, 
On route to Harrenhal Locke and his men attempt to rape Brienne, but are persuaded otherwise by Jaime, who lies , convincing Locke that Brienne's home of Tarth, known as the "Sapphire Isles", is named such due to an abundance of precious gemstones, and that Selwyn Tarth would richly reward him for returning his only child intact. Emboldened by his success, Jaime attempts to barter for his release by reminding Locke of the wealth and power of his own father, Lord Tywin. This has an adverse effect, however, and Locke, enraged by Jaime's arrogance and complacency mutilates him by severing his sword hand.
Locke delivers Jaime and Brienne to his Roose Bolton at Harrenhal. Bolton chides Locke for maiming such a valuable hostage.
As Lord Bolton leaves to attend to the wedding of Edmure Tully, Locke receives a raven from Lord Selwyn Tarth offering 300 golden dragons to ransom Brienne, but Locke refuses. As Jaime prepares to leave for King's Landing with Qyburn and Steelshanks Locke taunts him. Lock puts Brienne inside the Harrenhal bear pit for his amusement and that of his men, giving the warrior woman nothing but a wooden tourney sword to defend herself from the bear. To Locke's frustration, Jaime comes back to rescue Brienne and saves her from the pit with the aid of Steelshanks, who has no choice but to help Jaime to fulfill Lord Bolton's orders.
- See also the Locke article on the Game of Thrones, TV Series wiki.