Medieval society was rigidly divided by class and position. Saint Joan investigates the inner workings of this intricate structure. Among the things examined are the tiers of power within the Church, the political factions of kings and feudal lords, and the lot of common peasants and soldiers. We also see just how severe the punishment was for people who defied this rigid hierarchy.
Saint Joan presents an overall resentment for the upper class.
Joan's life as a commoner, gives her a clear eyed view of the problems France is facing. Her middle class upbringing gives her a certain objectivity, which her upper class betters could never have.