<span>After the plague was over, times were tough for the Catholic Church. Remember, in medieval times, the Church wielded incredible political power over the lives of many people whether they were kings or peasants. But when the Black Plague hit Europe, the Church was at a loss. Their promises to heal the sick turned out to be empty and people began to lose faith in the Church.</span>
Just write what you felt while reviewing the lesson, its very simple. Maybe put some research into this person
A classic novel can be about any subject.
It doesn't have to be with a villain [Classic love stories]
You dont need a handsome protagonist.
So your answer is:
A doctrine is essential to writing a classic novel.