The backdrop of the story of the hero Beowulf is set in Scandinavia during the early medieval period. The narrative begins with Beowulf, a warrior of the Geats, coming to the aid of King Hrothgar of the Danes, whose mead hall is under siege by the monster Grendel. The poem explores themes of heroism, loyalty, and the struggle against evil. Beowulf's battles with Grendel, Grendel's mother, and later a dragon illustrate the heroic code and the inevitable decline of the hero, reflecting the values and culture of the time.