The expansion of the Empire called for a systematic administrative organization that developed into a dual system of military ("Central Government") and civil administration ("Provincial System") and developed a kind of separation of powers: higher executive functions were carried out by the military authorities and judicial and basic administration were carried out by civil authorities. Outside this system were various types of vassal and tributary states. Most of the areas ruled by the Ottomans were explicitly mentioned in the official full style of the sultan, including various lofty titles adopted to emphasize imperial rank and show the empire as being "successor-in-law" to conquered states.