"Imperial Edict 273: Alderaan belongs to House Thul. That fact is beyond question. Yet House Ulgo dares to defy us. Ulgo troops have reclaimed the shield generator that once protected Castle Panteer. If reactivated, House Ulgo will gain an unacceptable advantage."
―Part of the edict, and following mission brief[src]

Imperial Edict 273 was an edict issued by the Sith Empire declaring the Imperial-aligned House of Thul to be Alderaan's rightful rulers. During the Cold War, this edict was used as justification for Imperial allies and forces to prevent House Ulgo from reactivating Castle Panteer's shield generator.