The next generation of Serbian rulers - the sons of Stefan Prvovenčani - Radoslav, Vladislav and Uroš I, marked a period of stagnation of the state structure.
The kingdom spread to the east by conquering the town of Niš and the surrounding counties, and to the south by acquiring territories in Macedonia.
The Serbian Army defended the country and won several victories, but it was finally overpowered by the forces of Germany, Austria-Hungary and Bulgaria, and had to withdraw from the national territory marching across the Albanian mountain ranges to the Adriatic Sea.
The Serbian climate varies between a continental climate in the north, with cold winters, and hot, humid summers with well distributed rainfall patterns, and a more Adriatic climate in the south with hot, dry summers and autumns and relatively cold winters with heavy inland snowfall.
The medieval Serbian state was re-formed in the Raška region in the 12th century by the Serbian Grand Župan Stefan Nemanja.
Education in Serbia is regulated by the Serbian Ministry of Education and Sports.