The inscription has to do with the construction of the Roman colony of Emona
The fragments of a marble plaque with a Latin inscription suggest that the first Roman Emperor Augustus and his successor Tiberius ordered the erection of a public building, perhaps a walled fortification in the city, and a plaque was fixed on this structure. The inscription most likely has to do with the construction of the Roman colony of Emona, though an older Roman settlement had been established about half a century before.
The inscription on the plaque reads in English as follows:
Imperator Caesar Augustus, son of the divine (Julius) the high priest,
thirteenth consul, twenty-first Emperor, in the thirty-seventh year of authority as tribune,
father of his country (and) Tiberius Caesar Augustus, son of divine Augustus,
second consul, sixth Emperor, in the sixteenth year of authority as tribune –
had given to (the city) [the walls with towers].