>The ring was actually unearthed during an excavation led by the Hebrew University of Jerusalem professor Gideon Foerster during the 1968–1969 season. However, only recently did a thorough cleaning and advances in photographic technology allow for the second interesting fact about this ring to be exposed: It bears the Greek inscription ΠΙΛΑΤΟ (PILATO)—the name of Pontius Pilate.
<The name PONTIUS PILATUS appears in Latin on the “Pilate Stone,” which was discovered in reuse in Caesarea. The Roman governor describes himself as [PRAEF]ECTUS IUDA[EA]E, or “Prefect of Judea.” Here, Pilate, who commissioned the inscription to honor his imperial benefactor, the emperor Tiberius, refers to himself in the Latin nominative (subject) case: PILATUS.
>Thus, for a Greek rendering of Pontius Pilate’s name in an inscription, we should expect the use of the nominative (subject) case, which would end in -os, or the genitive (possessive) case, which would end in -ou. This would be ΠΙΛΑΤΟΣ or ΠΙΛΑΤΟϹ (PILATOS) in the nominative or ΠΙΛΑΤΟΥ (PILATOU) in the genitive. However, on the so-called Pilate Ring discovered at the Herodium, we find ΠΙΛΑΤΟ (PILATO).
<It is entirely possible that the Pilate Ring unearthed at Herodium in 1969 and “discovered” this past year was not worn by the Roman prefect Pontius Pilate at all. Rather, it may very well have been worn by a regional administrator collecting taxes for the Romans, who simply stamped items and document seals bound for Pilate—PILATO.
https://www.biblicalarchaeology.org/daily/biblical-artifacts/inscriptions/pontius-pilate-ring-herodium/