House Broom

The Brooms are a Westerlands family whose origins reach back to the golden age of the First Men, long before the Targaryens ever set foot in Westeros. No known source credits them with a castle of their own, yet their name has remained bound to that of the Lannisters of Casterly Rock, whom they serve as vassals.

Their arms carry that age: a silver helm crested with a sprig of broom, set upon a field checkered in green and black.

When the Faith of the Seven rose in arms against the Iron Throne, House Broom sided with the Seven rather than with King Maegor I Targaryen. The choice cost them dearly: their castle was among the strongholds Maegor put to the torch with Balerion, the most feared dragon of his line.

No other trace of that episode survives beyond the burning itself; neither the exact date nor the name of the lost stronghold has come down to us.