After adoption of the decisions of Berlin Congress on 1 July 1878 the Sanjak of Sofia was merged with Northern Bulgaria into Principality of Bulgaria, a de facto independent vassal of the Ottoman Empire.
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It was founded in 1393 and disestablished in 1878 with establishment of the Principality of Bulgaria.
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The largest part of Sanjak of Niš was annexed by the Principality of Serbia after Russo-Turkish War (1877–1878), while smaller part and the whole Sanjak of Sofia were annexed by the Principality of Bulgaria.