Celtic Football Club is a professional association football club based Glasgow, Scotland. The club was founded in 1887 and began playing league football in 1890 as founder members of the Scottish Football League. Since their first season Celtic have remained in the top division of the Scottish football league system: the Scottish Football League (1890–93), Scottish Football League Division One (1893–1975), Scottish Football League Premier Division (1975–98), Scottish Premier League (1998–2013) and Scottish Premiership (2013–present). As of 2021–22 the club has completed 133 seasons of competitive football and have been Scottish football champions 52 times.