The Old Firm is the collective name for the Scottish football clubs Celtic and Rangers, who are both based in Glasgow. The origin of the term is unclear but may derive from the two clubs' initial match in which the commentators referred to the teams as "like two old, firm friends", and represents the commercial benefits of the two clubs' rivalry. The name may also be a reference to these two teams being among the original 11 members of the Scottish Football League formed in 1890. The rivalry between the two clubs has become deeply embedded in Scottish culture and has contributed to the political, social and religious division in Scotland and also beyond, especially in neighbouring Northern Ireland. As a result, the fixture was recognised as having enduring appeal.