I agree but better to say Jerusalem than Rome.
The Zealots thought they had to take over Judea as the Maccabees did several generations before. Judas Iscariot was one of these and thought he could push Jesus into becoming this temporal, worldly leader of the Jews. But Christ rejected that when he met Satan in the desert... Judas went on to be one of the most hated men in history.
Jesus was a King, THE King, but His Kingdom, as you say, is not nor ever was of this world. This world will perish in the End Times.