Padishah n. : Chief ruler; monarch; sovereign; -- a title of the Sultan of Turkey, and of the Shah of Persia.

Example:
Will the Imperial Sardaukar be able to defend the new Padishah Emperor against the forces of the Muad'Dib?

Taxonomy
Padishah Emperor, rulers, Afghanistan, free encyclopedia, Padshah, monarchies, Persian, Christian emperors, badshah, king, Islamic, History, successor, Amir, paramount, Turkish, Padshah-i-Ghazi, Badi.

Defination from the web:
Padishah, Padshah, Padeshah, Badishah or Badshah (Persian پادشاه Pādeshāh) is a superlative royal title, composed of the Persian pād "master" and ... In Frank Herbert's Dune series, the Padishah Emperor — also commonly referred to as "Emperor of the Known Universe" or "Emperor of a Million ...