The correct answer to the question: Which character is described in these lines: "but weapons of victory Swords and suchlike he had sworn to dispense with", would be: Beowulf.
"Beowulf" is an Anglo-Saxon epic poem, written in Old English, and it is not entirely known when exactly it was published, or by whom. Scholars believe that it must have been written between 975 and 1025. It narrates the story of "Beowulf" a hero who goes to the aid of the King of the Danes, Hrothgar, whose home has been under attack for quite some time by a monster known as Grendel. After several adventures, Beowulf defeats not just Grendel, but also his mother, and he returns home to become the king of the Geats, who lived in modern Sweden. Beowulf finally dies after several years, when he confronts a dragon but is wounded.
In this particular excerpt, from the chapter "Grendel is vanquished", Beowulf is talking about his hurdle with the monster, Grendel and the thoughts, bravery and strength that he must have. This is why the answer is Beowulf.