Sith King

"The guardian beasts called tuk'ata stand watch over the tombs and protect them from desecration. They have long been the royal companions of Sith Kings."

- Extract from Jen'jidai Sorzus Syn's titular chronicle

"Sith King" was a title traditionally held by certain rulers of the Sith species prior to the arrival of the Dark Jedi Exiles to Korriban in 6900 BBY at the end of the Hundred-Year Darkness.

Due to the kratocratic cultural mores of the Sith people, Sith Kings were generally among the most powerful Force users of their times and often engaged in protracted campaigns of conquest against their rivals. Many Sith Kings were protected by tuk'ata Sithspawn companions in life and death, buried in such sacred locations as the Valley of the Sleeping Kings and the Valley of Golg.

Among the most notable Sith Kings were Adas, Dathka Graush, and Hakagram Graush, the latter of whom was the last to have held the title prior to the formal establishment of the Sith Empire by the Exiles. The title fell out of widespread usage in the years that followed, replaced by the equivalent title Jen'ari meaning "Dark Lord of the Sith" in the Sith language.

Behind the scenes
Though Sith holding the title of "king" have appeared in the Legends continuity since 1996's Tales of the Jedi Companion, the term "Sith King" was first employed as a fully capitalized title on page 118 of the 2009 reference book The Essential Atlas and on page 142 of the 2010 sourcebook The Unknown Regions. It first saw usage as a proper noun in its own right on page 37 of the 2012 reference book Book of Sith: Secrets from the Dark Side.