One legend on the origin of the coat of arms of Naples claims that it alludes to the colors of the sun and moon cult practiced by the city's pre-Christian inhabitants.

Alternatively, it was considered to be a symbol of the struggles fought at the time of the independent Duchy (755–1027) against the Longobard Principality of Benevento and in alliance with the Norman Count of Aversa Rainulfo.

[6] The second document is a pilot book whose drafting dates back to the years 1325–1330 by Angelino Dalorto, in which unlike contemporary works, Naples is not assigned the Angevin insignia but a two-colored flag, the color of the parchment in the part of the rod and red in the other half.

[7] The first evidence in which the current coat of arms is used in an official document of the city is an act dated 31 January 1488, with which the Electi Civitatis Neapolis lodge an appeal against some Gabelles; the document has a seal imprinted on paper in turn attached to the sheet with red wax, on the seal there is the city coat of arms surmounted by a ducal crown and surrounded by the legend Sigillvm de Neapol.

During the Neapolitan Republic of 1647, established following the revolt of Masaniello, a letter P was placed in the center of the shield, as a symbol of the supremacy of the people, which then became an initial C of the word civitas.

From the competition, won by the company Vpoint (Luca Mosele art director), came the new logo with the cyan "wave" and the writing "Comune di Napoli", for which the Roman and bold Frutiger font is used, 1 January 2007, is present on all the acts of the municipality.