Ashdorkûz

The Ashdorkûz (Orc. "Sole Master" or "Sole Lord") was the Lord and King of all Orc tribes in Middle-earth. The Ashdorkûz had his followers practice the Dark Worship and was a position even higher than the Ashdurbúk (Orc. "Sole Ruler" ), as the bearer was the supreme overlord, even to the Chieftain of the Orcs of the Misty Mountains.

Morgoth and Sauron were the only beings known to have ever be Ashdorkûz, with the second Dark Lord even going further and stylizing himself as "Ashlargdorkûz" (Orc. "Sole Overlord".