Olympique Lyonnais, commonly referred to as simply Lyon or OL, is a French football club based in Lyon. 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 a record seven Trophée des Champions, five Coupe de France titles 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.