Catacombe di Commodilla (Catacombs of Commodilla), Roma (Rome), Lazio, Italy
These catacombs date back to the late Roman Empire (IV c. AC); they owe their name to a rich matron, that gave to the local Christian Church the land as a burial site.
You can see on a wall of it the probable first example of proto-Italian language: a graffiti inscription, dated between 6th and 7th century AC, marked “NON DICERE ILLE SECRITA A BBOCE -non dire le (parole) segrete ad alta voce- “DON’T SAY SECRET WORDS OUT LOUD” (a something between Latin and Italian). It remembered to the mass’ celebrant priest not to loudly pronounce the mysteria, secrete prayers addressed only to God and not to the believers.
The second image depicts Jesus with a Christian symbol of the origins: the A (Alpha) and the ω (or Ω) (Omega), first and last letters of the ancient Greek alphabet, an epithet of Christ, as the beginning and the end of the creation.
Unfortunately, at this time the catacombs can be visited only on request and with fee, even if a local committee is trying to make the site open for free.