Say unto the king and to the queen, Humble yourselves, sit down: for your principalities shall come down, even the crown of your glory.
King - Jehoiachin or Jeconiah.
Queen - the queen-mother, who, as the king was not more than 18 years old, held the chief power. Nehushta, daughter of Elnathan, carried away captive with Jehoiakim by Nebuchadnezzar (2 Kings 24:8-15).
Humble yourselves - not an exhortation to humble, but a prophecy, Ye shall be humbled, or brought low (Jeremiah 22:26).
Your principalities - х mar'ªshowteeykem (H4761), your greatnesses - i:e., all your dignity and family greatness, from ro'sh (H7219), the head] (Buxtorf). Rather, 'your head-ornament' (Maurer). I prefer the former.