Qyburn is an unethical former maester who was thrown out of the order for conducting illegal human experimentation. After coming into Cersei Lannister's service, he becomes Varys's replacement as Master of Whisperers on the small council. After Cersei is crowned as Queen of the Andals and the First Men, he becomes her Hand of the Queen.

(Source GOT wiki)

Community content is available under CC-BY-SA unless otherwise noted.