Helios is a character in the Lysander chapters of Iron Gold.
He is the Truth Knight, as well as the ArchKnight, of the Rim.
He is a part of Romulus' trial and it is revealed that he conspired with Dido to ensure that the trial ended as she planned - with two Sovereigns - because he too believes Romulus did not have knowledge of the evidence. [1]
Helios is described as looking like a falcon, with a long neck, and bald with a white mustache that is held together with iron clasps. He ceremonially wears a white cape "in harmony with [his] title." [2]