Ellis Peters's historical detail is very accurate and very minute and therefore is not only interesting to read but good for an actor to acquire a sense of the period. And the other thing I think is that an actor lives in the land of imagination.
Stop being conned by the old mantra that says 'Leaders are cool managers are dweebs.' Instead follow the Peters Principle: Leaders are cool. Managers are cool too!
Watching Bernadette Peters perform is like an acting class. She's amazing.