Character: Archbishop Rhea
Source: Fire Emblem Three Houses (and Warriors: Three Hopes)
Setting: After the fall of her monastery-fortress, Rhea got captured by the Adrestian Empire, and within short order Empress Edelgard, a former student at the monastery, decides that Rhea is too dangerous to be left alive and will face judgement for her crimes (too many to list, also that would be spoilers).
Up to you if she gets a proper public execution or dies ignominiously in some dark cell.