Arthur and George are the main characters in this story based on true events. But without more context, it's hard to say exactly who they were in real life.
In a way, it is. The story takes inspiration from real-life figures and incidents, but it's likely that the author used some artistic license to make the narrative more engaging and coherent.
I don't know the specific story Arthur George tells. Maybe it could be an adventure story, a family - related story or a fictional tale about magical creatures.
The two main characters are Arthur and George. Arthur is likely a character with certain influence or skills, like detective skills maybe. George is a character who gets into some sort of trouble, perhaps wrongly accused of something.
The main theme could be justice. Arthur, with his detective skills, tries to help George who has been wrongly accused, so it shows the pursuit of justice in the face of false accusations.