<P> The 1971 Ibrox disaster--in which 66 Rangers supporters died in a crush on an exterior stairway--occurred at the end of an Old Firm match, although the identity of the opposition was not a factor in the incident other than having drawn a large crowd of at least 75,000 to the event . </P> <P> The intensity of the rivalry is fuelled by the clubs' historical duopoly in Scottish football, with most meetings between them being pivotal in deciding the destiny of a championship or cup and anything but a title - winning season seen as a major disappointment, particularly as it would usually mean' the enemy' has won the trophy . </P> <P> Statistics show that Rangers and Celtic have been by far the most successful clubs involved in the Scottish Football League since its formation in 1890 . The pair were the only participants in every edition of the competition until 2012, when Rangers were removed from the top tier for economic reasons; they returned for the 2016--17 season . Of the 120 championships played, 102 (85%) have been won by one of the Old Firm with Rangers ahead on 54 titles to Celtic's 48, and 19 between ten other clubs (including a shared title between Rangers and Dumbarton). </P> <P> Although there have been brief periods when silverware went elsewhere, there have also been long spells of domination by each Old Firm club, the longest run of 9 - in - a-row being first set by Celtic between 1966 and 1974, matched by Rangers between 1989 and 1997 . </P>

Who has won more titles rangers or celtic