It was 'noble' of her to come forward with this information.
She married a man of 'noble' [='aristocratic'] birth/rank.
a 'noble' ideal/ambition/cause/purpose
(..) The best way to make alliances is with marriage. Who are you marrying this time? I don't know. Maybe no one. But you need to lure all the noble houses to the table? Are you a queen or fish bait? I can't bring a lover to Westeros. A king wouldn't think twice about it. So that's what you want? (..)2016 TvShow: Game of Thrones Title: The Winds of Winter Season: 6 Episode 10