Excalibur ĕkskăl´ĭbər [key], in Arthurian legend, sword given to King Arthur by the Lady of the Lake. At Arthur's death Sir Bedivere threw Excalibur into the lake; a hand rose from the water, caught the sword, and disappeared. Another sword, sometimes mistakenly identified with Excalibur, was drawn from a stone by Arthur to prove his royalty.
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