List of Scottish football champions
The SFL was established in 1890, initially as an amateur league until professionalism in Scottish football was legalised in 1893.[6] The current 39-year period of dominance by the Old Firm is a record; the previous longest streak was 27 years, between 1904 and 1931.Each of the two clubs has also claimed the double, by winning the league and the Scottish Cup in the same season, on many occasions.[9] Both Old Firm clubs have completed a treble (Celtic 8 times; Rangers 7) by also winning the Scottish League Cup.[9][10] In the 1966–67 season, Celtic took all three domestic trophies, and also won the European Cup to complete the only quadruple to date.