Qyburn

Qyburn is a character debuting in the third season of Game of Thrones. He is a former Maester of the Citadel who was stripped of his chain many years ago. Qyburn will be played by Anton Lesser.

In the books
In the Song of Ice and Fire novels, Qyburn is a former maester. He acts as a healer in the sellsword company known as the Brave Companions.