Then Nebuchadnezzar the king sent to gather together the princes, the governors, and the captains, the judges, the treasurers, the counsellors, the sheriffs, and all the rulers of the provinces, to come to the dedication of the image which Nebuchadnezzar the king had set up.
Then Nebuchadnezzar the king sent to gather together the princes - "satraps" of provinces. (Gesenius).
Captains - rulers, not exclusively military.
Sheriffs - men learned in the law, like the Arab Mufti (Gesenius).