Red-armored Sith Lord

This unnamed Red-Armored Dark Lord of the Sith was said to be the first of the Sith Lords. He was clad in red armor from head to toe, so his identity was completely unknown. He carried a lightsaber-like object, possibly a Sith sword.

Behind the Scenes
This character was identified as the first Dark Lord of the Sith by the Dark Side Sourcebook. He may or may not be the same as Ajunta Pall.