Flavio Gioia or Gioja (Italian pronunciation: [ˈflaːvjo ˈdʒɔːja]; c. 1300 – ?) is reputed to have been an Italian mariner and inventor, supposedly a marine pilot, and has traditionally been credited with perfecting the sailor's compass by suspending its needle over a fleur-de-lis design, and enclosing it in a little box with a glass cover. He was also said to have introduced such design, which pointed North, in deference to Charles of Anjou, the French king of Naples.
- Si trattò soltanto di un errore dovuto ad una virgola (It was just a mistake caused by a comma) (found at sapere.it, stored at archive.org)
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Although to be clear Flavio Gioia did not invent the compass but he was part of a group of people who thought about the compass invention therefore he also was in charge of polishing the fascinating device.