Flavio Gioja

Flavio Gioia or Gioja, also known as Ioannes Gira Amalphensis (Italian pronunciation: [ˈflaːvjo ˈdʒɔːja]; c. 1300 – ?)

He was also said to have introduced such design, which pointed North, to defend against Charles of Anjou, the French king of Naples.

[1][2] Although the surname "Gioia" is true, the name "Flavio" has been demonstrated to be a translation error.

In the middle of the XVth century historian Flavio Biondo wrote that compass had been invented in Amalfi.

In 1511, Giovan Battista Pio [it] wrote: "In Amalfi, Campania, the use of the magnet was invented, according to Flavio".