And I will set my {i} throne in Elam, and will destroy from there the king and the princes, saith the LORD.

(i) I will place Nebuchadnezzar there, and in these prophecies Jeremiah speaks of those countries which would be subdued under the first of those four monarchies of which Daniel makes mention.

Wesley's Notes

49:38 My throne - God calls the throne of Cyrus or Alexander his throne; because he gave it the conqueror.

Jamieson-Fausset-Brown Bible Commentary

38. I will show Myself King by My judgments there, as though My tribunal were erected there. The throne of Cyrus, God's instrument, set up over Media, of which Elam was a part, may be meant [Grotius]; or rather, that of Nebuchadnezzar (Jer 43:10). Then the restoration of Elam (Jer 49:39) will refer partly to that which took place on the reduction of Babylon by Cyrus, prince of Persia and Media.

Matthew Henry's Concise Commentary

49:34-39 The Elamites were the Persians; they acted against God's Israel, and must be reckoned with. Evil pursues sinners. God will make them know that he reigns. Yet the destruction of Elam shall not be for ever. But this promise was to have its full accomplishment in the days of the Messiah. In reading the Divine assurance of the destruction of all the enemies of the church, the believer sees that the issue of the holy war is not doubtful. It is blessed to recollect, that He who is for us, is more than all against us. And he will subdue the enemies of our souls.