Where did the plotters get the gunpowder?

The plotters of the Gunpowder Plot, primarily Guy Fawkes and his associates, obtained the gunpowder from the King's storehouses. They managed to acquire a significant amount of gunpowder by renting a cellar beneath the House of Lords, where they intended to detonate it during the State Opening of Parliament in 1605. Their plan was to kill King James I and restore Catholic rule in England.