Prefects were under the authority of Rome and were overseen by a governor. The Prefect of Palestine would have an army of auxiliaries which would increase in size at a time of tension or population growth within Jerusalem (for example - Passover).
Pontius Pilate was appointed prefect in AD26. During his early years in office, he acted provocatively and so many Jews opposed him. However, at the time of Jesus' trial, his position in Palestine was increasingly weak.
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