Mormont himself chose Jon to be his STEWARD.
Game of Thrones Season 5, Episode 2
Not his STEWARD...
Game of Thrones Season 1, Episode 7
has requested you
for his personal STEWARD.
Game of Thrones Season 1, Episode 7
I wasn't a STEWARD in the Night's Watch,
or son of Randyll Tarly, or any of that.
Game of Thrones Season 4, Episode 9
I was his STEWARD. In fact...
Game of Thrones Season 6, Episode 7