You are a maester of the Citadel,
Game of Thrones Season 2, Episode 6
that had him expelled
from the Citadel, Your Grace.
Game of Thrones Season 4, Episode 10
is not being immediately
expelled from the Citadel.
Game of Thrones Season 7, Episode 3
So, why did the Citadel take your chain?
Game of Thrones Season 3, Episode 7
He read about their marriage
at the Citadel
Game of Thrones Season 8, Episode 2