Gra?anski nogometni klub Dinamo Zagreb commonly referred to as GNK Dinamo Zagreb or simply Dinamo Zagreb is a Croatian football club based in Zagreb. They play their home matches at Stadion Maksimir. They are the most successful club in Croatian football, having won 18 Prva HNL titles, 14 Croatian Football Cups and four Croatian Football Super Cups. The club has spent its entire existence in top flight, having been members of the Yugoslav First League from 1946 to 1991, and then the Croatian First League since its foundation in 1992. Dinamo Zagreb was founded on 9 June 1945. They entered the Yugoslav First League in its inaugural 1946–47 season, finishing as runners-up. In their second season in Yugoslav top flight in 1947–48 they finished as Yugoslav champions which was their first major trophy. The club won three more league titles and seven Yugoslav Cups. Amid the breakup of Yugoslavia and formation of the Croatian football league system, Dinamo left the Yugoslav league in 1991. Dinamo are the only Croatian club with European silverware, having won the 1966–67 Inter-Cities Fairs Cup by defeating Leeds United in the final. They also finished runners-up in the same competition in 1963 when they lost to Valencia. Until the early 1990s, its foundation year was considered to be 1945 but amid political turmoil during the breakup of Yugoslavia the club began claiming direct lineage to pre-WWII clubs Gra?anski Zagreb and HAŠK. In order to reflect this in June 1991, it was renamed HAŠK Gra?anski, which lasted until February 1993 when it was renamed Croatia Zagreb. They won five league titles and participated in the 1998–99 and 1999–2000 UEFA Champions League group stages carrying that name before reverting to Dinamo Zagreb in February 2000. Although the subject was dropped for a while, in 2011, club management increasingly began claiming that Dinamo is the direct descendant of Gra?anski (which had originally been founded in 1911 and disbanded in 1945) and in April that year decided to prepend the adjective "Gra?anski" to the club's official name, turning it into the present-day GNK Dinamo (Gra?anski nogometni klub Dinamo or "Citizens' Football Club Dinamo"). The team's traditional colour is royal blue, which has been replaced for European matches in recent times with the darker navy blue. The club's biggest rivals are Hajduk Split, and matches between the two teams are referred to as "Eternal Derby." Dinamo are currently reigning Croatian league champions having won their eleventh consecutive Prva HNL title in the 2015–16 season.