
"until the HEIR come of age."
Game of Thrones Season 1, Episode 7

as long as I could still give him an HEIR.
Game of Thrones Season 6, Episode 5

Stannis Baratheon is Robert's true HEIR.
The throne is his by rights.
Game of Thrones Season 1, Episode 9

This was Balon Greyjoy's son and HEIR.
Game of Thrones Season 4, Episode 2

arresting the HEIR to Highgarden?
Game of Thrones Season 5, Episode 6