We have proof. We have the BLADE.
Game of Thrones Season 1, Episode 3
And if I fight with an edged BLADE,
Game of Thrones Season 4, Episode 2
Fine little BLADE.
Game of Thrones Season 4, Episode 1
For a man on horseback,
the curved BLADE is a good thing,
Game of Thrones Season 1, Episode 3
That's a fine little BLADE.
Game of Thrones Season 2, Episode 3