Keeper of the Keys
Keeper of the Keys is a position of in the royal court in the Seven Kingdoms under the rule of House Targaryen and House Baratheon of King's Landing. There are four Keepers of the Keys, which are managed and selected by the Master of Coin.
The four Keepers control the keys that open certain doors and chests that belong to the royal household and oversee the items that these locks guard. One holds charge of the king's jewels, another has charge of the king's purse -- those funds that the king keeps purely for his own interests -- another commands the key to the Red Keep's armory, and the last holds the keys to the king's manors outside of King's Landing. Their responsibilities include hiring of assistants, overseeing investments of personal wealth, and acquiring such things as the king desires.