It is unclear what you are trying to do. Beowulf is an epic poem of the Norse Germanic tradition. It is Dark Ages material rather than Middle Ages Feudalism and specifically refers to events circa the 6/7th century in Denmark.
One could constrast and compare the fealty shown by Dark Ages warriors to a High King with the much more formal land based requirements of Feudalism but I am not sure if that is what you are trying to do.
The warrior class of the Dark Ages essentially worked for their kin Chief or perhaps even the High King. This was a direct relationship whereby the King supplied meat, drink and weapons.
Feudalism was on a larger scale with the King siting in Government. The Lords and Knights actually administered the land with the Serfs working the land for the local Lord. A Dark Ages king had direct contact with his warriors whereas under Feudalism if things were quiet a king might not see his Lords for years on end.
So, in short, the relationship between warrior and king during the Dark Ages was very personal whereas under feudalism it was administrative and impersonal. This can be seen in the poem where Beowulf's family are beholden by the kindness and generosity of their king and where Beowulf feels honour bound to serve him. This can easily be described through reference to Beowulf's father (Ecgtheow) and the heroic actions of Beowulf in serving the king who was kind to his father (Hrothgar) and fighting the monster (Grendel).
.... Presumably you will read the poem (rather you than me)
Feudalism was actual a bit of a dull grind, largely concerned with growing cabbages and keeping books (and burning the odd heretic). Poems like Beowulf and the tales of King Arthur, both from an earlier warrior caste society, fuelled the high Middle Ages love of romanticism and chivalry. In that sense Beowulf did have a part in forming a view on who the people in the Middle Ages thought they were. The Lords might be kicking Serf butt to get more cabbages but in their hearts they were Beowulf.
Might be best to ignore the last paragraph.
At least that is my opinion.
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