Why did so many medieval knights fight snails?

If you’ve ever looked at medieval art you might well have seen images of knights fighting all sorts of monsters. And snails. Actually, you might have noticed knights fought snails often. Why is that?

This video from Vox looks at the observations of Michael Camille and the theory of Lilian Randall. The snails, suggests Randall, are Lombards – a family of money lenders who had become despised across Europe.