Historical Administrative Divisions Of The Ottoman Empire

The administrative divisions of the Ottoman Empire were administrative divisions of the state organisation of the Ottoman Empire. Outside this system were various types of vassal and tributary states.
The Ottoman Empire was first subdivided into provinces, in the sense of fixed territorial units with governors appointed by the sultan, in the late 14th century. The beylerbey, or governor, of each province was appointed by the central government. Sanjaks were governed by sanjak beys (sancakbeyi), selected from the high military ranks by the central government. Beylerbeyis had authority over all the sancakbeyis in a region. Kaza was a subdivision of sancak and referred to the basic administrative district, governed by a kadı.
It is considered extremely difficult to define the number and exact borders of Ottoman provinces and domains, as their borders were changed constantly. Until the Tanzimat period, the borders of administrative units fluctuated, reflecting the changing strategies of the Ottomans, the emergence of new threats in the region, and the rise of powerful Ayans. All the subdivisions were very unequal in regard of area and population, and the presence of numerous nomadic tribes contributed to the extreme variability of the population figures
In English, Ottoman subdivisions are seldom known by a myriad of Turkish terms (vilayet, eyalet, beylerbeylik, sancak, nahiye, kaza, etc.) which are often eschewed in favour of the English-language denomination (e.g. "province", "county", or "district") that is perceived to be the closest to the Turkish original. These translations are rarely consistent between the works of different scholars, however.
The initial organization dates back to the Ottoman beginnings as a Seljuk vassal state (Uç Beyliği) in central Anatolia. The Ottoman Empire over the years became an amalgamation of pre-existing polities, the Anatolian beyliks, brought under the sway of the ruling House of Osman.
This extension was based on an already established administrative structure of the Seljuk system in which the hereditary rulers of these territories were known as beys. These beys (local leadership), which were not eliminated, continued to rule under the suzerainty of the Ottoman sultans. The term bey came to be applied not only to these former rulers but also to new governors appointed where the local leadership had been eliminated.
The Ottoman Empire was, at first, subdivided into the sovereign's sanjak and other sanjaks entrusted to the Ottoman sultan's sons. Sanjaks were governed by sanjakbeys, military governors who received a flag or standard -- a "sanjak" (the literal meaning) -- from the sultan.
As the Empire expanded into Europe, the need for an intermediate level of administration arose and, under the rule of Murad I (r. 1359-1389), a beylerbey ("bey of beys") or governor-general was appointed to oversee Rumelia, the European part of the empire. At the end of the 14th century, a beylerbeylik was also established for Anatolia, with his capital at Kütahya. He was always considered inferior in rank to the beylerbey of Rumelia, since large areas nominally under his control were given to the ruler's sons.
Following the establishment of beylerbeyliks, sanjaks became second-order administrative divisions, although they continued to be of the first order in certain circumstances such as newly conquered areas that had yet to be assigned a beylerbey. In addition to their duties as governors-general, beylerbeys were the commanders of all troops in their province.
Following the conquests between 1362 and 1400 of Murad I and his son Bayezid I, a need arose for the formal organisation of Ottoman territory.
First-level divisions
There were two main eras of administrative organisation. The first was the initial organisation that evolved with the rise of the Empire and the second was the organisation after extensive administrative reforms of 1864.
Eyalet (also pashalic or beglerbeglic) was the territory of office of a beylerbeyi, and was further subdivided in sanjaks. Toward the end of the 16th century, beglerbegiliks began to be known as eyalets. The beglerbegiliks where the timar system was not applied, such as Habesh, Algers, Egypt, Baghdad, Basra and Lahsa, were more autonomous than the others. Instead of collecting provincial revenues through sipahis, the beglerbegi transferred fixed annuals sums to Istanbul, known as the salyane.