Why is Celtic vs Rangers called the Old Firm and which team has won the most Glasgow derbies?

CELTIC and Rangers fixtures are commonly known as the Old Firm derby in Scotland.

The two Glasgow based clubs are the most successful in Scottish football, winning 102 league titles between them.

But the Rangers and Celtic rivalry is one of the most complex in world football.

The clubs have been battling on the pitch for Scottish football supremacy for over a century.

SunSport breaks down the history between two of the most supported clubs in the world.

Why is Celtic vs Rangers called the Old Firm game?

How did the rivalry start?

The rivalry was mainly on the pitch at first, and when Celtic were formed in 1888, they invited local team Rangers to play the first game at Parkhead.

The opening of a shipyard in Govan by the Belfast shipbuilders Harland & Wolff in 1912, is seen as the catalyst for politics to come into play in Glasgow.

Then followed general alignment of mainly Scottish Catholic support for Celtic and the Protestant community in the country following Rangers.

Who has won the most derbies between them?

It's pretty close considering the first game was back in 1890.

Rangers have won 160 with Celtic winning 157.

The Blues are also ahead on league wins on 120 with the Bhoys trailing on 107.

However, Celtic come out on top when it comes to the Scottish FA Cup with 25 wins to 16 over their Old Firm rivals.