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.
Beowulf 8. Who is Beowulf? Beowulf is a Geatish hero who fights the monster Grendel, Grendelâs mother, and a fire-breathing dragon. 9. Name the country from which Beowulf comes. Geat Lands 10. Who is Higlac, and how is Beowulf related to him? (lines 109-111) Higlac is King of the Geats and Beowulfâs uncle. 11. What does Beowulf decide to do? Why? gathered the mightiest 12. Why did Beowulfâs kinsmen urge him to go? (lines 114-119) Hrothgar needed help and the Geats loved Beowulf.