I was looking at the letter's to the minor cultist from the sage's, and saw the one sent to the monger was signed P. and after finding out that the Cultist Sage is a king of Sparta, you can conclude that the traitor king is King (P)ausanias. (mind blown) unfortunately you can't use that as evidence. Still, interesting foreshadowing, right? This was during my 6th or somthing play through but heh, cool right.