Vassal and tributary states of the Ottoman Empire

The Ottoman Empire had a number of tributary and vassal states throughout its history.

In exchange for certain privileges, its vassal states were obligated to render support to the Ottoman Empire when called upon to do so.

Ottomans first demanded only a small yearly tribute from vassal princes, as a token of their submission.

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.