'Empire' in the Bible

In every matter of wisdom and insight the king asked them about, he found them to be ten times better than any of the magicians and astrologers that were in his entire empire.

The first (the Babylonian Empire under Nebuchadnezzar) was like a lion and had the wings of an eagle. I kept looking until its wings were plucked, and it was lifted up from the ground and made to stand on two feet like a man; a human mind was given to it.

And behold, another beast, a second one (the Medo-Persian Empire), was like a bear, and it was raised up on one side (domain), and three ribs were in its mouth between its teeth; and it was told, ‘Arise, devour much meat.’

After this I kept looking, and behold, another one (the Greek Empire of Alexander the Great), like a leopard, which had on its back four wings like those of a bird; the beast also had four heads (Alexander’s generals, his successors), and power to rule was given to it.

After this I kept looking in the night visions, and behold, [I saw] a fourth beast (the Roman Empire), terrible and extremely strong; and it had huge iron teeth. It devoured and crushed and trampled down what was left with its feet. It was different from all the beasts that came before it, and it had ten horns (ten kings).

In the first year of Darius son of Ahasuerus, who was of Median descent and who had been appointed king over the Babylonian empire --

And now I will tell you the truth. Behold, three more kings are going to arise in Persia. Then a fourth will gain far more riches than all of them; as soon as he becomes strong through his riches, he will arouse the whole empire against the realm of Greece.

Then the king of the north will advance against the empire of the king of the south, but will withdraw to his own land.