Daniel 7:6-7, 23

After this I beheld, and, lo, another, like a leopard, which had upon its back four wings of a bird; the beast had also four heads; and dominion was given to it. After this I saw in the night-visions, and, behold, a fourth beast, terrible and powerful, and strong exceedingly; and it had great iron teeth; it devoured and brake in pieces, and stamped the residue with its feet: and it was diverse from all the beasts that were before it; and it had ten horns.

Thus he said, The fourth beast shall be a fourth kingdom upon earth, which shall be diverse from all the kingdoms, and shall devour the whole earth, and shall tread it down, and break it in pieces.