'Ruler' in the Bible

Now there was a man of the Pharisees {whose name was} Nicodemus, a ruler of the Jews.

Now is the judgment of this world! Now the ruler of this world will be thrown out!

I will no longer speak much with you, for the ruler of the world is coming, and he has {no power} {over} me.

and concerning judgment, because the ruler of this world has been condemned.