The Queen of the Ancient Castle, known in-game as simply Queen, is a non-player character from Final Fantasy VI. She was the ruler of the Ancient Castle during the time of the War of the Magi. The Queen uses a gray-scale sprite of Celes in her opera gown. She is referred to as a princess instead of a queen in the Japanese version.
A thousand years ago, the Queen ruled the Ancient Castle and was in love with the esper Odin. Because of their different races, the love was seen as forbidden and she kept her feelings to herself. When the castle came under siege, Odin was the last esper remaining to defend them. Writing in her diary, the Queen decided she would confess her feelings to Odin when the siege ended. However, a powerful magus petrified Odin and the castle was overrun, and the Queen was turned to stone while taking refuge in a secret chamber of the castle. Eventually, the castle was buried in a massive underground cavern.
After the cataclysm, Figaro Castle's tunneling path became altered so that it passed by a cave system connecting to the Ancient Castle. The party explored the cavern when a Figaro engineer noticed something was in their way. In the underground castle they found the Queen's diary and stone remains. When they examined them, the stone shed a tear that infused the magicite remains of Odin with new power, transforming it into the magicite Raiden. If Terra is in the party, she reflects on the forbidden love between a human and an esper mirroring that of her parents.