Then shalt thou say unto them, Thus saith the LORD, Behold, I will fill all the inhabitants of this land, even the kings that sit upon David's throne, and the priests, and the prophets, and all the inhabitants of Jerusalem, with drunkenness.
Upon David's throne - literally, who sit for lª- David on his throne; implying the succession the Davidic family (so also margin, Jeremiah 22:4, "sitting for David upon his throne").
All - indiscriminately of every rank.