Adam Clarke on Matthew 27:2

They - delivered him to Pontius Pilate - The Sanhedrin had the power of life and death in their own hands in every thing that concerned religion; but as they had not evidence to put Christ to death because of false doctrine, they wished to give countenance to their conduct by bringing in the civil power, and therefore they delivered him up to Pilate as one who aspired to regal dignities, and whom he must put to death, if he professed to be Caesar's friend. Pontius Pilate governed Judea ten years under the Emperor Tiberius; but, having exercised great cruelties against the Samaritans, they complained of him to the emperor, in consequence of which he was deposed, and sent in exile to Vienna, in Dauphiny, where he killed himself two years after.