In the play within a play, Azdak plays the role of Grand Duke. How is the Grand Duke's personality presented?

A man who ruled the entire province and under whom many men, including the Governor, served. He is forced into exile for two years when the Fat Prince takes over but returns with an army and kills the Fat Prince. He then saves Azdak's life by allowing Azdak to remain a judge.

The Grand Duke is described as the Grand Thief, the Grand Murderer, and the Grand Swindler.