The Thirteen have spoken.
Game of Thrones Season 2, Episode 4
But we are the Thirteen,
Game of Thrones Season 2, Episode 4
You are one of the Thirteen.
Game of Thrones Season 2, Episode 7
HARALDSON: What age are you, boy?
Thirteen.
Vikings Season 1, Episode 3
Thirteen!
Game of Thrones Season 2, Episode 4