Sanjak of Bosnia (Turkish: Bosna Sancağı, Serbo-Croatian: Bosanski sandžak / Босански санџак) was one of the sanjaks of the Ottoman Empire established in 1463 when the lands conquered from the Bosnian Kingdom were transformed into a sanjak and Isa-Beg Isaković was appointed its first sanjakbey. In the period between 1463 and 1580 it was part of the Rumelia Eyalet. After the Bosnia Eyalet was established in 1580 the Bosnian Sanjak became its central province. Between 1864 and the Austro-Hungarian occupation of Bosnia in 1878 it was part of the Bosnia Vilayet that succeeded the Eyalet of Bosnia following administrative reforms in 1864 known as the "Vilayet Law". Although Bosnia Vilayet was officially still part of the Ottoman Empire until 1908 the Bosnian Sanjak ceased to exist in 1878.