Excalibur is a rock formation on the North Rim of the Grand Canyon in northern Arizona, part of a group of canyon landmarks named from Arthurian legend. Cartographer and geologist François E. Matthes gave it this name in 1908 after King Arthur’s legendary sword, associated with the Lady of the Lake. The name likely alludes to a spire near the top of the promontory that suggests a sword’s handle. Nearby features such as Holy Grail Temple, King Arthur Castle, Guinevere Castle, Elaine Castle, and Galahad Point continue this theme, reflecting an early Grand Canyon naming tradition inspired by myth and legend.