This embarrassment to the Citadel?
Game of Thrones Season 5, Episode 2
A maester of the Citadel, chained and sworn,
Game of Thrones Season 5, Episode 7
I hear you studied poisons at the Citadel.
Game of Thrones Season 4, Episode 3
The Citadel stripped me of it.
Game of Thrones Season 3, Episode 5
Brought shame on the Citadel
with his repugnant experiments.
Game of Thrones Season 4, Episode 2