The Citadel isn't Castle Black.
Game of Thrones Season 6, Episode 3
that had him expelled
from the Citadel, Your Grace.
Game of Thrones Season 4, Episode 10
A raven arrived from the CITADEL
this morning, Your Grace.
Game of Thrones Season 2, Episode 1
So, why did the Citadel take your chain?
Game of Thrones Season 3, Episode 7
Why does the Citadel
have the biggest library?
Game of Thrones Season 5, Episode 5