House Greyjoy is the principal noble house on the Iron Islands; many lesser ironborn houses are sworn to them. Their seat is at Pyke. Their sigil is a golden kraken on a black field, and their words are "We Do Not Sow."
The House descends from the legendary Grey King in the Age of Heroes. The Greyjoys became Lords Paramount of the Iron Isles after the Targaryen conquest, when Aegon I allowed the ironborn to choose who would have primacy over them. They chose Vickon Greyjoy and his line.
ALLIED HOUSES: None
ENEMY HOUSES: All Great Houses of Westeros