Arthur’s famous weapon was Excalibur which is almost synonymous with the hero himself. After he pulls the sword out of the stone as a timid young boy, he slowly evolves into this brave king under the mentorship of Merlyn.
As for Beowulf, “A rare and ancient sword name Hrunting. The iron-blade with its ill-boding patterns had been tempered in blood. It had never failed the hand of anyone in battle.” (Heaney,