King Arthur's legendary magical sword in Arthurian legend, often depicted as unbreakable and of immense power.
From Old French 'Escalibor', possibly from Welsh 'Caled' (hard) and 'Bor' (flashing), though origins are debated. The name has appeared in Arthurian tales since at least the 12th century.
Excalibur's name was probably meant to sound impressive and otherworldly, and it worked so well that the sword's name became more famous than the actual legends—now everyone recognizes 'Excalibur' before they know Arthur's story!
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