Caiaphas was high priest
GradeFirm
The Gospels name Caiaphas as the high priest at the time of Jesus' trial: Luke has "Annas and Caiaphas being the high priests" (), and John says, "Then led they Jesus from Caiaphas unto the hall of judgment" (). Josephus, writing independently, confirms it. He records that the governor Gratus made "Joseph Caiaphas" high priest (Antiquities 18.35), and that Vitellius "deprived Joseph, who was also called Caiaphas, of the high priesthood" (18.95), on the same visit in which he sent Pilate to Rome. Caiaphas therefore held office through the whole of Pilate's term, just as the Gospels assume. An ornate ossuary found in Jerusalem in 1990, inscribed "Yehosef bar Qayafa", probably belonged to the same priestly family.
Firm. Caiaphas was high priest from about 18 CE to 36 or 37 CE. The clue confirms the window set by Pilate's term without narrowing it.
Explore the counterarguments
There is no real dispute about Caiaphas' term. Its limit as a dating clue is that it spans all of Pilate's years, so it adds confirmation but no precision. The identification of the ossuary with the high priest's family is probable rather than certain, and some scholars question the reading of the name or the identification.