There is a story that James Keiller invented marmalade in the 18th century when a cargo of Seville oranges was stuck in Dundee harbour because of fierce storms. He bought the cargo but could not sell the cheek-puckering fruit, whereupon his wife took some and made jam.

But there are flaws in the story. It appears that Keiller opened his marmalade factory in 1797, before he got married. And marmalade from Seville oranges was already a known product, although it had nothing to do with Queen Mary being ill (“Mary malade”), another myth about the origins of this curious product.