Why is Celtic vs Rangers called the Old Firm Derby?

Here's all you need to know about the biggest rivalry in Scottish football, why it's called the Old Firm and more

Celtic vs Rangers is one of the most passionate – and heated – club rivalries in the world, matching the intensity of the likes of El Clasico between Barcelona and Real Madrid.

The two have a storied rivalry, their matchup extending past the limits of football and into deeper themes of national identity and religion.

Goal has everything you need to know about why it's called the Old Firm Derby, the history behind the two clubs and more.

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Why is Celtic vs Rangers called the Old Firm Derby?

It is understood that their rivalry has been dubbed the "Old Firm" since the early…