Excalibur
Comics
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Excalibur is a fictional superhero group appearing in American comic books published by Marvel Comics. They are depicted as an offshoot of the X-Men, usually based in the United Kingdom. Wikipedia
Members: Captain Britain, Kitty Pryde, Betsy Braddock, and more
Founders: Roma
Base(s): The Lake House (Empress Matilda Docks, Rotherhithe); Lighthouse; Braddock Manor; Muir Isle
First appearance: Excalibur Special Edition #1 (December 1, 1987, on sale)
Publisher: Marvel Comics