'Mighty Angel' in the Bible

And I saw a mighty angel announcing in a loud voice, "Who is fit to open the roll and break its seals?"

Then I saw another mighty angel descend from heaven. He was clothed in a cloud, and a rainbow encircled his head. His face was like the sun, his legs were like pillars of fire,

Then a mighty angel caught up a stone like a great millstone and threw it into the sea, saying, "With such violence will Babylon the great city be hurled to destruction and never be seen again!