The Celtic F.C. is based in Scotland.
Celtic F.C. . The club 's greatest season was 1966 -- 67 , when Celtic became the first British team to win the European Cup , also winning the Scottish league championship , the Scottish Cup , the League Cup , and the Glasgow Cup . Glasgow ( [ ˈɡlɑːzɡəʊ , _ ˈɡlæ - , _ - s - ] Glesga Glaschu [ ˈkl̪ˠas̪əxu ] ) is the largest city in Scotland , and third largest in the United Kingdom . The Glasgow Cup is a knockout football tournament open to teams from Glasgow .