King Of Kings

And he hath on his vesture and on his thigh a name written, King of Kings, and Lord of Lords.  Revelation 19:16
The nineteenth chapter of Revelation describes the return of Jesus Christ to earth in the end time, when He will triumph over all His enemies.  According to verse 16, He will wear a banner across His royal robe.  It will be emblazoned with the phrase “King of Kings.”  This name, emphasizing His supreme rule over all the earth, will be prominently displayed for everyone to see.
In Old Testament times, the title “king of kings” was assigned to a ruler with an empire that covered a wide territory.  Often, a king of an empire would allow the rulers of conquered nations or tribes to keep their royal titles for political and economic reasons.  But it was clear that the “king of kings” was the undisputed ruler of his vast domain. Thus, the Persian ruler Artaxerxes referred to himself as “king of kings” in a letter that he sent to Jerusalem with Ezra the priest (Ezra 7:12).
When Jesus returns in glory, He will be the sole ruler of the universe.  Meanwhile, He rules over His kingdom, known as the church.  If we belong to Him, we are subjects of His kingdom.  He should already be King of Kings in our lives.  
In a passage that looked forward to the birth of the Messiah, the prophet Zechariah called Jesus the King over All the Earth (Zechariah 14:9).