In a four person realm, you can be protested out of office by a single person. No one is safe. Even a single public protest will cause a loss of prestige.
I am not sure if either Hadron or Urtagoth can be banned. I think they are both royals.
Turns out Urtagoth could be banned which surprised me.
I like to think that Turin getting tortured helped all this by lowering his honor and prestige.