Known. The stone names the centurion Gaius Valerius Verecundus, of the First Italic Legion.
It was found at Novae, on the Lower Danube, about 4 kilometres from modern Svishtov. The graves date to the 2nd to 3rd century. Five burial places were found after a tree fell on private land. The centurion's plate was written in verse and had been built into a later stone grave. Another reused stone names a veteran of the same legion from Iconium, now Konya in Turkey. The graves had already been disturbed.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/roman-tombstone-novae-00102550