Daniel 2:40

2:40 Then there will be a fourth kingdom, one strong like iron. Just like iron breaks in pieces and shatters everything, and as iron breaks in pieces all of these metals, so it will break in pieces and crush the others.

Daniel 7:6

7:6 “After these things, as I was watching, another beast like a leopard appeared, with four bird-like wings on its back. This beast had four heads, and ruling authority was given to it.