Maribor are one of three Slovenian teams which participated in the Yugoslavia's highest division, the Yugoslav First League, between the end of World War II in 1945 and the breakup of Yugoslavia in 1991. The club is also one of the two founding members of the Slovenian PrvaLiga who have never been relegated from the top flight since the league's establishment in 1991. In addition, Maribor is the only Slovenian club to have participated in the group stages of the UEFA Champions League and UEFA Europa League. Besides that, the club is one of the only two clubs from former Yugoslavia, beside Red Star Belgrade, that have won an official UEFA trophy since winning the 2006 UEFA Intertoto Cup.