Padishah

Padeshah, Padshah, Padishah or Badishah (Persian: پادشاه‎‎, Turkish: padişah) is a superlative royal title of Persian origin, composed of the Persian pād "master" and the widespread shāh "king", which was adopted by several monarchs claiming the highest rank, roughly equivalent to the ancient Persian notion of "The Great" or "Great King", and later adopted by post-Achaemenid and Christian Emperors. Its Arabized pronunciation as Badshah was used by Mughal emperors.

The rulers on the following thrones – the first two effectively commanding major West Asian empires – were styled Padishah:

The paramount prestige of this title, in Islam and even beyond, is clearly apparent from the Ottoman Empire's dealings with the (predominantly Christian) European powers. As the Europeans and the Russians gradually drove the Turks from the Balkans, Central Asia, and the Caucasus, they insisted—even at the cost of delaying the end of hostilities—on the usage of the title "Padishah" for themselves in the Turkish versions of their treaties with the High Porte, as acknowledgement that their Christian emperors were in all diplomatic and corollary capacities the equal of the Turkish ruler, who by his religious paramount office in Islam (Caliph) had a theoretical claim of universal sovereignty (at least among Sunnites).

...
Wikipedia