Now it was the day of Preparation of the Passover. It was about the sixth hour. He said to the Jews, “Behold your King!” They cried out, “Away with him, away with him, crucify him!” Pilate said to them, “Shall I crucify your King?” The chief priests answered, “We have no king but Caesar.”
(John 19:14-15 ESV)
Throughout the trial and crucifixion of Jesus, he is repeatedly referred to as the King of the Jews. Despite the motives of the people saying it at the time, it is true.
Jesus is more than (but including) the king of the Jews, as he tells Pilate in 18:36, his kingdom is not of this world. Jesus created the universe, He sustains it, He chose to enter it and he will return and rule it for ever. At the point, every knee will bow and every tongue confess that He is in his rightful place!
His kingdom is so far above this little power struggle in a particular local area at a particular point in history it’s laughable to compare. At that point in history, Jesus didn't seem like a king and Pilate and Caesar held all the power. But now, Pilate and Caesar are confined to the history books while Jesus is worshiped by a billion people around the world. Jesus is the true King.