Episode 742: Making Bank : Planet Money On today's show, how a band of medieval warrior monks sworn to poverty got into the banking business and changed the way we think about money forever.

Episode 742: Making Bank

Episode 742: Making Bank

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Temple Church in London, England Gary Ullah/Flickr hide caption

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Gary Ullah/Flickr

Temple Church in London, England

Gary Ullah/Flickr

During the Middle Ages, Christian pilgrims en route to Jerusalem had a problem. They needed to pay for food, transport and accommodation during their journey across Europe, which could take months. They also didn't want to carry large amounts of precious coinage because they'd become a target for robbers. This became an obstacle to worship.

That's where the Knights Templar stepped in. The Knights Templar were a bunch powerful monks who defended Christian pilgrims. They had a solution to this cash issue. Pilgrims could leave money safely protected with the Knights Templar in England and withdraw it in Jerusalem. No cash needed. Pilgrims could just carry a letter of credit. It was basically a private bank before there was anything else like it. This was a pretty modern idea.

Today on the show, we trace the evolution of banks from the Knights Templar to today. It's the story of how a band of warrior monks working out of a very old church in London changed the way we think about money. There's bloodshed, world domination, and lots of accounting.

This episode features an excerpt from the BBC World Service series and podcast, "50 Things That Made the Modern Economy," hosted by Tim Harford. Listen and subscribe here.

Music: "Another Round" and "Deep Thinkers." Find us: Twitter/ Facebook.