These were: (1) Raska, which had been Caslav's centre and is considered the birth-place of the Serbian state (this district, with the town of Ras as its centre, included the south-western part of the modern kingdom of Serbia and what was the Turkish sandjak or province of Novi-Pazar); (2) Zeta, on the coast (the modern Montenegro); and (3) Bosnia, so called after the river Bosna, which runs through it.

15 The Rise and Fall of the Serbian Empire and the Extinction of Serbian Independence, 1168-1496 From 1168 the power of the Serbs, or rather of the central Serb state of Raska, and the extent of its territory gradually but steadily increased.