Black Dragon's Castle

The Black Dragon's Castle was one of eight keeps which housed the rulers of the feuding states of old Sosaria during the events of Ultima I. It was located within the Lands of the Dark Unknown.

Description
Little is known about the ruler of the Black Dragon's Castle, or their presumed co-ruler in the Castle of Olympus, save that they were masters the Lands of the Dark Unknown during the first Age of Darkness.

During the Stranger's quest to defeat Mondain, the hero had need to consult with whomever ruled over this castle, requiring a red gem in their possession in order to activate the time-traveling device necessary to reach the  wizard's stronghold. The lord of the keep granted this to the Stranger, but only after they had proven their mettle by slaying a lich. Also at this time, the imprisoned Princess Beth could be found  within this keep. The hero had the option of securing her rescue - although such action proved detrimental to relations with the guards and court.

It is not known what eventually befell the Black Dragon's Castle or its master, as the Lands of the Dark Unknown vanished shortly after the death of Mondain.

Trivia

 * There is also a White Dragon's Castle located within the  Lands of Danger and Despair which proved far more infamous in the annals of  Britannian history, although it is not known if the King of the Black Dragon bore any relation to the maddened ruler of this ill-fated keep.