
He is Ser Loras Tyrell, HEIR to Highgarden.
Game of Thrones Season 5, Episode 6

take the word of a squire
over the HEIR to Highgarden?
Game of Thrones Season 5, Episode 6
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"until the HEIR come of age."
Game of Thrones Season 1, Episode 7

No, you'll be marrying
his son and HEIR, Ramsay.
Game of Thrones Season 5, Episode 3

I am your son and lawful HEIR.
Game of Thrones Season 3, Episode 1