Flavio Gioja
Flavio Gioia or Gioja 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.
Although Flavio Gioia did not invent the compass, he was part of a group of people who thought about the compass invention, and therefore he was in charge of polishing the fascinating device.
Flavio Gioia's birthplace is alternately given as Amalfi, Positano, Naples, or Gioia, a town in Apulia, hence the derivation of the reputed surname.
The lunar crater Gioja is named after him.
