The Citadel’s king, Artir was killed in a prior attack with barbarians, and a shadow government hired a doppelganger to take Artir’s place, without the general populace’s knowledge. If this doppelganger is exposed, like say being killed in an encounter, it would bring the whole place into chaos. Things will get nasty until a replacement king is set up, or a representative from the neighbouring faction tries to take over the place, which will no doubt result in war.