The thrones — The kingdoms of this world were destroyed by God the king, and judge of all, called the Ancient of days, because of his eternal deity.
Related Commentaries of Daniel 7:9
Daniel 7:9
9 I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool: his throne was like the fiery flame, and his wheels as burning fire.