'Ruler' in the Bible

And he saith unto them, Draw out now, and bear unto the ruler of the feast. And they bare it.

When the ruler of the feast had tasted the water that was made wine, and knew not whence it was: (but the servants which drew the water knew;) the governor of the feast called the bridegroom,

There was a man of the Pharisees, named Nicodemus, a ruler of the Jews:

Now is the judgment of this world. Now the ruler of this world will be cast out.

I will not talk with you much longer, because the ruler of the world is coming. He has no power over Me.

and about judgment, because the ruler of this world has been judged.