One of the Houses of The Institute. House Jupiter selected a massive young man as their firstDraft. They occupied the mountains to the northwest and seized the lands of House Juno. They sent the main part of their force to besiege House Mars, leaving them vulnerable to House Pluto and to Darrow. The Jackal and House Pluto infiltrate the castle and seize it for themselves, surrendering it to Darrow as part of an attempt to catch him off guard. The rest of House Jupiter is defeated when Darrow returns to House Mars's castle.