CHAPTER: IT IS FORBIDDEN TO CALL THE RULER AS THE KING OF KINGS OR SHAHINSHAH
Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: The vilest name in Allaah's sight is Malik al-Amidh (King of Kings). The narration transmitted on the authority of Shaiba (contains these words): There is no king but Allaah, the Exalted and Glorious. Sufyan said: Similarly, the word Shahinshah (is also the vilest appellation). Ahmad b. Hanbal said: I asked Abu 'Amr about the meaning of Akhna. He said: The vilest.
Abu Huraira reported from Allaah's Messenger (sallAllaahu alayhi wa sallam) so many ahadith and one of them was this that Allaah's Messenger (sallAllaahu alayhi wa sallam) said: The most wretched person in the sight of Allaah on the Day of Resurrection and the worst person and target of His wrath would of the person who is called Malik al-Amlak (the King of Kings) for there is no king but Allaah.