A constitution is a statement of the basic principles and laws of a nation, state, or group, such as the U.S. Constitution. Another very common meaning of constitution is the physical makeup of a person. So think of a constitution as how a body (yours, the government's) is set up. If you have a strong constitution, it means you don't get sick very often.
I think the focus of the story is on Beowulf as a hero rather than a king because it is his heroic deeds that lead to him being offered the throne. Also to be king one must possess some type of heroic qualities in order to rule a land and its people.
The Contrast in the Characteristics of a Hero in Beowulf and Sir Gawain and the Green Knight. ...contrast in the characteristics of a hero in Beowulf and Sir Gawain and the Green Knight The word âheroâ can be defined in many ways. Some would say a hero is a mythological term for a man or a woman with great power (superhuman), who is honored in their village.