Royale Union Saint-Gilloise , abbreviated to Union SG or USG, unofficially simply called Union, is a Belgian football club originally located in the municipality of Saint-Gilles, in Brussels, although since the 1920s it has been based at the Joseph Marien Stadium in the neighbouring municipality of Forest. The club is one of the most successful in the history of Belgian football. The club won eleven Belgian championships between 1904 and 1935, making it the most successful Belgian club before World War II. The team colours are blue and yellow and its matricule is 10. The team is traditionally popular with working class communities of southern Brussels, as well as more recently with more affluent supporters and workers of the European institutions, as well as both the French and the Flemish speaking free universities. On 13 March 2021, after defeating local rivals R.W.D. Molenbeek, Union was promoted back to the Belgian First Division A, marking its first appearance in top-flight football in 48 years. The following year, they finished top of the table at the end of the regular season, the first club in Belgian history to do so the season after promotion to the top flight. Union would go on to finish second in the champions play off, securing Champions League qualification for the first time ever in club history, and after being eliminated in the third qualifying round, secured a spot in the group stage of the Europa League. History The club was founded in 1897 and obtained its first of eleven titles as Champion of Belgium in 1904. From 1933 to 1935 the team played 60 consecutive matches undefeated, setting a still unbeaten record in Belgium. In the early 1900s, the club also had a dominant spell in some of the very first "European" Cup competitions that took place, prior to officially sanctioned UEFA competitions. Between 1958 and 1965 the club had a brief spell of European success, playing in the Inter-Cities Fairs Cup, reaching the semi-finals in the 1958–60 edition after a two legged victory against A.S. Roma. In 1963, however, the club was relegated to the second division, and in 1980 even fell as low as the Belgian Promotion division. On 21 May 2018, Tony Bloom, chairman of English Premier League side, Brighton & Hove Albion was confirmed as the majority shareholder. Alex Muzio, the Chairman of Union, was a co-investor with Tony Bloom in 2018