God here calls the throne of Nebuchadnezzar, or Cyrus, or Alexander, (whoever he was that conquered the Persians,) his throne:
1. Because God gave it the conqueror.
2. Or because God showed himself the Lord of hosts, or the Lord of the whole earth, by disposing the kingdom of Persia at his pleasure. He doth not threaten the destruction of the whole nation, but the making of it all tributary, so as it should have no kings nor princes of its own.