Jeremiah 13:18
Say unto the king and to the queen, Humble yourselves, sit down: for your principalities shall come down, even the crown of your glory. Say unto the king and to the queen, Humble yourselves, sit down: for your principalities shall come down, even the crown of your glory.
The command is directed to the king and to the queen of Judah, bidding them to humble themselves and sit down because their royal authority and glory will be brought down. The crown of their glory shall come down with that humbling. In this place the word principalities means earthly power only, earthly rule and dominion whose glorious crown shall come down.
Most other biblical uses of principality likewise mean earthly powers, and together with this verse they prove that the principalities and powers to which Christians are told to be subject are earthly human governments.