23 And he said, The fourth beast shall be the fourth kingdom on the earth, which shall excel all [other] kingdoms, and shall devour the whole earth, and trample and destroy it.
Daniel 7:23 Cross References - LXX2012
Daniel 2:40
40 and a fourth kingdom, which shall be strong as iron: as iron beats to powder and subdues all things, so shall it beat to powder and subdue.
Daniel 7:7
7 After this one I looked, and behold a fourth beast, dreadful and terrible, and exceedingly strong, and its teeth were of iron; devouring and crushing to atoms, and it trampled the remainder with its feet: and it was altogether different from the beasts that were before it; and it [had] ten hours.