They're from the Brotherhood.
They follow the Red God.
Game of Thrones Season 6, Episode 7
We think it was an infiltrator from
the Brotherhood Without Banners.
Game of Thrones Season 2, Episode 7
One of the outlaws
in the BROTHERHOOD.
Game of Thrones Season 1, Episode 3
He wants to be one of you. He wants
to join the Brotherhood. Stop them!
Game of Thrones Season 3, Episode 6
They're the Brotherhood.
Game of Thrones Season 7, Episode 5