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.
Read more about this topic: Subdivisions Of The Ottoman Empire
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... Like the Beylerbey, the Sanjak-bey was also a military commander ... The term sanjak means ‘flag’ or ‘standard’ and, in times of war, the cavalrymen holding fiefs in his sanjak, gathered under his banner ...