The majority of Serbs inhabit the nation state of Serbia (with a minority in disputed Kosovo), as well as Bosnia and Herzegovina, Croatia and Montenegro.
Serbia is landlocked and borders Hungary, Romania, Bulgaria, Macedonia, Croatia, Bosnia, and Montenegro.
The history of the early medieval Serbian Principality is recorded in the 10th-century work De Administrando Imperio, which describes the Serbs as a people living in Roman Dalmatia, subordinate the Byzantine Empire.
Numerous small Serbian states were created, chiefly under Vlastimorović and Vojislavjević dynasties, located in modern Bosnia and Herzegovina, Croatia, Montenegro, and Serbia.
The origin of the ethnonym is unclear (see Names of the Serbs and Serbia).
Genetic studies on Serbs show that they have close affinity with the rest of the Balkan peoples and especially those within former Yugoslavia; Y-DNA results show that haplogroups I2a and R1a together stand for roughly two thirds of the makeup (as of 2014).