
charged with TREASON.
Game of Thrones Season 1, Episode 8

How can it be TREASON to kill Lannisters?
Game of Thrones Season 2, Episode 7

would be considered TREASON.
Game of Thrones Season 1, Episode 3

Then the Lannisters caught me
and executed me for TREASON.
Game of Thrones Season 3, Episode 5

after you took your leave.
The word "TREASON" was mentioned.
Game of Thrones Season 1, Episode 5