The Ottoman Empire had a number of tributary and vassal states throughout its history. Its tributary states would regularly send tribute to the Ottoman Empire, which was understood by both states as also being a token of submission. In exchange for certain privileges, its vassal states were obligated to render support to the Ottoman Empire when called upon to do so. Some of its vassal states were also tributary states. These client states, many of which could be described by modern terms such as satellite statesorpuppet states, were usually on the periphery of the Ottoman Empire under suzerainty of the Sublime Porte, over which direct control was not established, for various reasons.
Ottomans first demanded only a small yearly tribute from vassal princes, as a token of their submission. They later demanded that a vassal prince's son should be held as hostage, that the prince should come to the Palace once a year and swear allegiance, and that he should send auxiliary troops on the sultan's campaigns. Vassal princes were required to treat the sultan's friends and enemies as their own. If the vassal failed in these duties, his lands would be declared as darülharb (lit. territory of war) open to the raids of the Ghazis.[1]
There were also secondary vassals such as the Nogai Horde and the Circassians who were (at least nominally) vassals of the khansofCrimea, or some Berbers and Arabs who paid tribute to the North African beylerbeyis, who were in turn Ottoman vassals themselves.
