Qyburn

Qyburn is a recurring character in the third season. He is portrayed by Anton Lesser and debuts in "Valar Dohaeris". He is one of the prisoners at Harrenhal left for dead by Ser Gregor Clegane.

Background
Qyburn is a former maester of the Citadel. He was stripped of his chain by the Archmaesters for engaging in forbidden experiments.

Season 3
Qyburn is among the Northern and Riverlands prisoners at Harrenhal when Ser Gregor Clegane abandons the castle and has all captives put to the sword. Qyburn, however, survives the injury at his throat and awakens when the castle is taken by the Northern army. After he wakes, he identifies himself to Robb Stark while Talisa Stark tends to his wound. After Robb Stark left Harrenhal, Qyburn stayed behind serving under Lord Roose Bolton. He tended to Ser Jaime Lannister's badly infected stump. During this Jaime notices that Qyburn is not a Maester, because he isn't wearing a maester's chain of office. Qyburn acknowledges this, explaining that he was stripped of his chain by the Citadel and thrown out of the Order of Maesters he was conducting experiments which they felt were too "bold".

Qyburn volunteers to join the party escorting Jaime back to King's Landing. Lord Bolton theorizes that the former Maester is doing so in the hopes that Tywin Lannister will force the Citadel to restore his chain. After leaving Harrenhal, Qyburn informs Jaime that the Citadel removed his maester's chain for performing experiments on living humans in order to learn more about their anatomy. When Jaime then asks Qyburn about Brienne, he tells him that she will most likely serve as entertainment for Locke and his men that night, but she will more than likely be killed after that.

Later, Qyburn arrives in King's Landing with Jaime and Brienne.

Quotes
"The only way to treat disease, is to understand disease."

- Qyburn

In the books
In the A Song of Ice and Fire novels, Qyburn is a former maester who acts as a healer in the sellsword company known as the Brave Companions. Qyburn never met Robb Stark, nor ever was injured while staying at Harrenhal.

According to Gendry, Qyburn is rumored to practice black sorcery and necromancy.