Beowulf rules the Geats for 50 years. After succeeding Hygelac and later Heardred, he becomes a respected king who protects his people through a long period of peace and stability.
The poem then jumps forward to Beowulf’s old age. A thief steals a cup from a dragon’s treasure hoard, provoking the dragon to attack Geatland. Beowulf, now an aging ruler rather than the young warrior who fought Grendel, decides to face the creature himself.
The final battle shows the costs of his long reign. Beowulf kills the dragon with help from Wiglaf, but the dragon’s venomous bite proves fatal. His death leaves the Geats vulnerable, and they mourn both their king and the uncertain future of their kingdom.
The 50-year figure is sometimes confused with the 50 years mentioned elsewhere in the poem, including the time between Beowulf’s earlier battles and the dragon’s attack. In both cases, the number emphasizes the extraordinary length of his life and public career.