Shah (Šâh or Şah) (; , , "king") is a title given to the emperors/kings and lords of Iran (historically also known as Persia). It was also adopted by the kings of Shirvan (a historical Iranian region in Transcaucasia) namely the Shirvanshahs, the rulers and offspring of the Ottoman Empire (termed there as Şeh), the Bengal Sultanate, as well as in Georgia, Afghanistan, and Pakistan. In Iran (Persia and Greater Persia) the title was continuously used; rather than King in the European sense, each Persian ruler regarded himself as the Šâhanšâh (King of Kings) or Emperor of the Persian Empire. The word descends from Old Persian Xšâyathiya "king", which (for reasons of historical phonology) must be a borrowing from Median, and is derived from the same root as Avestan xšaΘra-, "power" and "command", corresponding to Sanskrit (Old Indic) kṣatra- (same meaning), from which kṣatriya-, "warrior", is derived. The full, Old Persian title of the Achaemenid rulers of the First Persian Empire was Xšâyathiya Xšâyathiyânâm or Šâhe Šâhân, "King of Kings" or "Emperor". This word is commonly confused with the unrelated and distinct Indian surname Shah, which is derived from the Sanskrit Sadhu/Sahu (meaning gentleman ).