Darth Andeddu, also referred to as the Immortal God-King of Prakith, was an ancient humanoid male who reigned as Dark Lord of the Sith, and was dubiously thought of as the forebear of the "Darth" title.
A paranoid man, Andeddu believed that his subordinate Sith Lords—whom he regarded as his enemies—wanted to claim his vast collection of Sith lore and ritual for themselves. He was eventually betrayed and overthrown by his followers, forcing him to flee the planet Korriban for the Deep Core.
Andeddu made the world of Prakith his domain where he ruled for centuries as a deity until his physical demise, at which time he entombed himself in an attempt to deprive his pursuers of the power they sought to steal. Prior to his physical death, Andeddu stored all of his wisdom within a holocron which also contained his most arcane secret: the ability to cheat death by transferring one's essence into another vessel.
A Sith cult founded by Lord Andeddu called the "Malevolence" constructed a temple in reverence of their Dark Lord, and guarded the fortress for generations in anticipation of the God-King's return.