question #3 Sahih al-Bukhari 6206, Book 78, Hadith 230 : How does Islam view the concept of ultimate sovereignty and authority?

The Prophet (ﷺ) said, “The most awful (meanest) name in Allah’s sight.” Sufyan said more than once,
“The most awful (meanest) name in Allah’s sight is (that of) a man calling himself king of kings.”
Sufyan said, “Somebody else (i.e. other than Abu Az-Zinad, a sub-narrator) says: What is meant by
‘The king of kings’ is ‘Shahan Shah.,”