The final act of the Anglo-Saxon poem Beowulf includes Beowulf's fight with a dragon, the third monster he encounters in the epic. On his return from Heorot, where he killed Grendel and Grendel's mother, Beowulf becomes king of the Geats and rules wisely for fifty years until a slave awakens and angers a dragon by stealing a jewelled cup from its lair. When the angry dragon mercilessly burns the Geats' homes and lands, Beowulf decides to fight and kill the monster personally. He and his thanes climb to the dragon's lair where, upon seeing the beast, the thanes flee in terror, leaving only Wiglaf to battle at Beowulf's side. When the dragon wounds Beowulf fatally, Wiglaf attacks it with his sword, and Beowulf kills it with his dagger.

Beowulf is an Old English epic poem in the tradition of Germanic heroic legend consisting of 3,182 alliterative lines. It is one of the most important and most often translated works of Old English literature. The date of composition is a matter of contention among scholars; the only certain dating is for the manuscript, which was produced between 975 and 1025 AD. Scholars call the anonymous author the "Beowulf poet". The story is set in pagan Scandinavia in the 6th century. Beowulf, a hero of the Geats, comes to the aid of Hrothgar, the king of the Danes, whose mead hall Heorot has been under attack by the monster Grendel for twelve years. After Beowulf slays him, Grendel's mother takes revenge and is in turn defeated. Victorious, Beowulf goes home to Geatland and becomes king of the Geats. Fifty years later, Beowulf defeats a dragon, but is mortally wounded in the battle. After his death, his attendants cremate his body and erect a barrow on a headland in his memory.