Daniel 2:37

Of kings. This title was used by the Persians. Nabuchodonosor was at that time the most potent monarch on earth. He conquered many nations, and greatly embellished the city of Babylon, surrounding it with three walls in fifteen days, and building hanging gardens, which were the wonder of the world. See Eusebius, præp. ix. 41. and x. 42. &c. (Calmet)