Gyles Rosby

"Lord Gyles."

- Sansa Stark greets Gyles Rosby

Gyles Rosby is a minor character in Game of Thrones. He was played by an unidentified extra and appears in "The Pointy End" and "Fire and Blood." He is the Lord of Rosby and the head of House Rosby, a noble house of the Crownlands, who is constantly present at the royal court in the Red Keep.

Season 1
Lord Gyles is present at the session in which Janos Slynt is created Lord Slynt and given the castle of Harrenhal and later Ser Barristan Selmy is dismissed from the Kingsguard. When Sansa Stark appears to ask for mercy for her father, Lord Gyles is greeted by the young lady, though he doesn't answer.

Lord Gyles is also present at court when the troubadour Marillion is forced to perform a limerick in which he ridiculed the late King Robert and Queen Cersei. Alongside the rest of the courtiers, Lord Gyles claps after King Joffrey begins to clap sarcastically.

In the books
In the Song of Ice and Fire novels, Gyles Rosby is the head of House Rosby, a noble house that rules over an eponymous town in the Crownlands. He's noted for being sickly and constantly coughing. Initially just one of the many courtiers at the Red Keep, he gains a more prominent role in later books.