Caisteal Òrach or Golden Castle was the last royal estate that once belonged to the MacRory Dynasty on the planet Halkirk in the Loomis System.
It was part of the Crown Lands deeded to the Crown by Tavis MacRory when he was crowned King Tavis I on the stipulation that all such lands would revert to his family should the monarchy be abolished. The Loomis Prosperity Party did not honor that agreement however and took the lands as "government property", leaving only Caisteal Òrach, the smallest and least valuable of the royal estates, to the family. (SI4)