'King' in the Bible

They have a king over them, the angel of the abyss: his name in Hebrew, Abaddon, and in Greek he has for name Apollyon.

And they sing the song of Moses bondman of God, and the song of the Lamb, saying, Great and wonderful are thy works, Lord God Almighty; righteous and true are thy ways, O King of nations.

These shall make war with the Lamb, and the Lamb shall overcome them; for he is Lord of lords and King of kings: and they that are with him called, and chosen, and faithful.

And he has upon his garment, and upon his thigh, a name written, King of kings, and Lord of lords.