In 1961 an Italian archaeologist, Antonio Frova, discovered an inscription at Caesarea Maritima on a stone slab which at the time of the discovery was being used as a section of steps leading into the Caesarea theatre.  The inscription in Latin contained four lines, three of which are partially readable.  Roughly translated they are as follows:-

Tiberium
Pontius Pilate
Prefect of Judea

The inscribed stone was probably used originally in the foundation for a Tiberium (a temple for the worship of the emperor Tiberius) and then reused later in the discovered location.  This inscription clarifies the title of Pontius Pilate as “prefect” at least during a time in his rulership.  Tacitus and Josephus later referred to him as “procurator”.  The NT calls him “governor” (Mt 27:2), a term which incorporates both titles.  This inscription is the only archaeological evidence of both Pilate’s name and this title.  (Evidence That Demands a Verdict, p67)