First Issue #1 - April 1988
Last #125 - October 1998
Continued in Excalibur (2001 series)
Excalibur is an off-shoot of the X-Men, usually based in the United Kingdom. Conceived by writer Chris Claremont and artist/co-writer Alan Davis, the original Excalibur first appeared in Excalibur Special Edition.
The first Excalibur consisted of the British superhero Captain Britain, his lover Meggan, and several one-time members of the X-Men and related mutant teams. Originally, the series involved cross-dimensional travel that incorporated as many elements of Captain Britain's mythos as it did the X-Men's.