Olympique Lyonnais, commonly referred to as simply Lyon or OL, is a French professional football club based in Lyon in Auvergne-Rhône-Alpes, It plays in France's highest football division, Ligue 1. The club was formed as Lyon Olympique Universitaire in 1899, according to many supporters and sport historians, but was nationally established as a club in 1950. The club's most successful period has been the 21st century. The club won its first Ligue 1 championship in 2002, starting a national record-setting streak of seven successive titles. Lyon has also won eight Trophées des Champions, five Coupes de France and three Ligue 2 titles. Lyon has participated in the UEFA Champions League 12 times, and during the 2009–10 season, reached the semi-finals of the competition for the first time after three previous quarter-final appearances. Olympique Lyonnais plays its home matches at the 59,186-seat Parc Olympique Lyonnais, commercially known as Groupama Stadium, in Décines-Charpieu, a suburb of Lyon. The club's home colors are white, red and blue. Lyon was a member of the G14 group of leading European football clubs and are founder members of its successor, the European Club Association.