A monarchy existed on the planet of Wayland, with its leader being Joruus C'baoth, a Dark Jedi.
Both The Heir to the Empire Sourcebook and The Thrawn Trilogy Sourcebook present Joruus C'baoth and the Guardian of Mount Tantiss as one and the same. Despite The Essential Guide to Characters from 1995 attempting to explain that Joruus C'baoth was the creator of the kingdom, it still states that he served as the protector and guardian of Mount Tantiss for a significant duration.