Thirteen.
Vikings Season 1, Episode 3
I've demanded a meeting of the Thirteen.
One of them did this or knows who did.
Game of Thrones Season 2, Episode 7
Pyat Pree is one of the Thirteen.
Game of Thrones Season 2, Episode 5
Thirteen!
Game of Thrones Season 2, Episode 4
You are one of the Thirteen.
Game of Thrones Season 2, Episode 7