<P> Mullery went on to manage Crystal Palace for two seasons (1982--1984) and then returned to Brighton for the 1986--87 season . </P> <P> The rivalry between the two clubs carried on throughout the 1980s . Following their joint promotion to the First Division in 1979, the teams met four times in the top flight with Palace failing to record a victory against Brighton . </P> <P> In 1982, Crystal Palace chairman Ron Noades appointed Alan Mullery as Palace manager, which was met with hostility by Palace fans . Crowds at Selhurst dropped significantly partly as a result of the appointment, and Mullery's record against Brighton as Crystal Palace manager was poor, losing both his clashes against the Seagulls . Mullery eventually left the club in 1984 . </P> <P> With both sides back in the second tier, the 1985 match at Selhurst Park saw the end of Brighton favourite Gerry Ryan's career following a tackle by Palace defender Henry Hughton which broke the winger's leg in three separate places . The game was followed by some of the worst violence seen between the two sets of fans . </P>

Why is there a rivalry between brighton and crystal palace