Yesterday's King
From The Fifth City Wiki
Very likely the Gracious Widow's son. In any case, he has become immortal through a deal with the Bazaar. After about 400 years of immortality he led a rebellion against The Masters. The Master razed the fourth city to the ground, and deposited him in the Forgotten Quarter. Most survivors joined one of the Khanate factions at zee. Since then, he seems to have had some run ins with Irrigo, as his memories are very jumbled.
He has a dislike of Devils, but is willing to help anyone that seems to be plotting the overthrow of The Masters.