What are the motifs in Edward II: The Troublesome Reign and Lamentable End of Edward the Second, King of England, with the Tragical Fall of Proud Mortimer by Christopher Marlowe?

Duty and responsibility are recurring ideas. Edward's preoccupation with Gaveston would not be a matter of concern to the nobles if it did not threaten the state. It is Edward's lack of interest in pressing matters, such as France's takeover of Normandy and the battle in Scotland, that drives them to the treasonable point of questioning their king. Edward's first order of business as king seems to have been to mail a letter to Gaveston, releasing him from banishment and offering to share the kingdom with him.