Cover to The Uncanny X-Men #135 (July 1980), by Byrne & Terry
Austin. The Uncanny X-Men
Byrne joined Claremont beginning with The X-Men #108 (Dec. 1977).
Their work together (along with inker Terry Austin) on such
classic story arcs as the "Dark Phoenix Saga" and "Days of Future
Past" would make them both fan favorites, and X-Men became one of
the industry’s best-selling titles. Byrne has repeatedly
compared his working relationship with Claremont to Gilbert and
Sullivan, and has said that they were "almost constantly at war
over who the characters were."[7] After more than three years on
Uncanny X-Men, during which time he created the character
Shadowcat (Kitty Pryde
http://cafurl.com?i=12622), Byrne left the
title with issue #143 (Mar. 1981).