The Ottoman Empire developed over the years as a despotism with the Sultan as the supreme ruler of a centralized government that had an effective control of its provinces, officials and inhabitants. Wealth and rank could be inherited but were just as often earned. Positions were perceived as titles, such as viziers and aghas. Military service was a key to many problems.
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.
