
I stole a considerable number
of books from the Citadel library,
Game of Thrones Season 8, Episode 2

but everyone in the Citadel,
Game of Thrones Season 7, Episode 1

I hear you studied poisons at the Citadel.
Game of Thrones Season 4, Episode 3

The Citadel?
Game of Thrones Season 5, Episode 5

The Citadel stripped me of it.
Game of Thrones Season 3, Episode 5