
If the Queen Regent and her son meet them,
I'll give them peace.
Game of Thrones Season 2, Episode 1

"to rule as REGENT...
Game of Thrones Season 1, Episode 7

Lord Stark, King Joffrey and the Queen Regent
request your presence in the Throne Room.
Game of Thrones Season 1, Episode 7

I am Queen Regent.
Game of Thrones Season 2, Episode 2

I suppose it is former Queen Regent now.
Game of Thrones Season 4, Episode 2