Theon Greyjoy is the son of Lord Balon Greyjoy. When he was young, he was taken by Eddard Stark as a hostage, and raised with the Stark family.
Thoros: You still mad at us, boy?
Gendry: You sold me to a witch.
Thoros: A priestess. I'll admit, it is a subtle distinction.
Beric: We're fighting a great war. Wars cost money.
Gendry: I wanted to be one of you. I wanted to join the brotherhood, but you sold me off... like a slave. Do you know what she did to me? She strapped me down in the bed. She stripped me naked.
The Hound: Sounds alright so far.
Gendry: And put leeches on me.
The Hound: Was she naked, too?
Thoros: She needed your blood.
Gendry: Yes, thank you. I know that.
The Hound: Could have been worse.
Gendry: She wanted to kill me. They would have killed me if it wasn't for Davos.
The Hound: But they didn't, did they? So what are you whinging about?
Gendry: I'm not whinging.
The Hound: Your lips are moving and you're complaining about something. That's whinging. This one's been killed six times. You don't hear him whinging about it.
All hail Bran the Broken first of his name, king of the Anders and the First Men, Lord of the Six Kingdoms, protector of the realm.Tyrion