This isn't 100% accurate, because Arthurian myth is complicated and confusing AF. In some legends, they are separate swords, and this post is accurate. In other myths, Caliburn and Excalibur are the same sword, just with two names.
Me who watched Monty Python and the Holy Grail and knows Excalibur is the sword that the watery tart threw at Arthur: pfffft amateurs, obviously I knew that already
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