King of Kings is a title that has been used by several monarchies and empires throughout history. The title originates in the Ancient Near East. It is sometimes used as the equivalent of the later title Emperor.
The first king known to use the title "king of kings" (šar šarrāni) was Tukulti-Ninurta I of Assyria (13th century BC). The title used to be intended quite literally, as a šar or mlk was the title of a king of a city-state, and with the formation an empire in the Late Bronze Age, the Assyrian rulers installed themselves as rulers over the existing structure of rulers (kings) of city-states.
The Persian title of a king of kings is shahanshah /ˈʃɑːənˈʃɑː/, associated especially with Zoroastrian Persian Achaemenid Empire, where it referred to the monarch ruling over other monarchs who had a vassal, tributary or protectorate position.
The title is mentioned in the Hebrew Bible, as מלך מלכיא, applied to Nebuchadnezzar and to Artaxerxes. In Daniel 2:37, Daniel interprets the dream of Nebuchadnezzar to the effect that
Lord of Lords may refer to:
Lord, I give myself
I trust in You mighty God
My Saviour
And Your mercy and love
Overflows and my soul rejoices
Lord show me Your ways
Guide my steps
Lead me to Your righteousness
And the light of Your love
Takes my fear away
'Cause I know You walk before me
Oh, my Shepherd
You let me rest in Your arms
You comfort me
And everywhere that I go
I'm not alone
Mighty God