Essays / Theme of loyalty in literature of middle ages? [3]

So the topic of my essay is discuss the theme of loyalty in literature of the middle ages.
i got a bunch of information online and decided I'm mainly going to focus on beowulf and chivalry but im stuck writing the introduction paragraph. i feel i can use the information to write the body paragraphs but an introduction / thesis was never my strong point..

can i get some help you guys? how would you guys write the intro paragraph to a essay topic like this?

thanks