In the 15th century, historian Flavio Biondo reported that the compass was invented by the people of Amalfi. Later, the philologist Giambattista Pio picked up the story and wrote it down like this: “Amalphi in Campania veteris magnetis usus inventus, a Flavio traditur,” which translates to: The use of the compass was invented in Amalfi, Campania, as reported by Flavio.
But then, something unexpected happened: someone shifted the comma. The new version—”Amalphi in Campania veteris magnetis usus inventus a Flavio, traditur”—completely altered the meaning: The use of the compass was invented in Amalfi, Campania, by Flavio, as reported.
This subtle mix-up passed through the ages, and just like that, Flavio Gioia, the “inventor” of the compass, was born. Interestingly, “Gioia” is a toponym, pointing to an imaginary birthplace in Apulia.
It’s wild how one misplaced comma can spin a whole new tale! While Gioia’s story is fun, the compass itself goes way back. It was first used in China during the Han dynasty (around 206 BC), but not for navigation—rather, for divination. It didn’t get turned into a navigation tool until the Song dynasty in the 11th century. And as for Europe and the Islamic world? They didn’t catch on until around 1190. So, the compass’s history is a bit more complex than a single legend.
