military neutrality. The country provides universal health care and free primary and secondary education to its citizens. Etymology The origin of the name Serbia is unclear. Historically, authors have mentioned the Serbs ( / Срби) and the Sorbs of Eastern Germany (Upper Sorbian: Serbja; Lower Sorbian: Serby) in a variety of ways: Cervetiis (Servetiis), gentis , Suurbi, Sorabi, Soraborum, Sorabos, Surpe, Sorabici, Sorabiet, Sarbin, Swrbjn, Servians, Sorbi, Sirbia, Sribia, Zirbia, Zribia, Suurbelant, Surbia, Serbulia / Sorbulia among others. These authors used these names to refer to Serbs and Sorbs in areas where their historical and current presence is not disputable (notably in the Balkans and Lusatia). However, there are also sources that mention the same or similar names in other parts of the World (most notably in the Asiatic Sarmatia in the Caucasus). There exist two prevailing theories on the origin of the ethnonym *Sŕbъ (plur. *Sŕby), one from a Proto-Slavic language with an appellative meaning of a "family kinship" and "alliance", while another from an Iranian-Sarmatian language with various meanings. In his work, De Administrando Imperio, Constantine VII Porphyrogenitus suggests that the Serbs originated from White Serbia near Francia. According to the recorded tradition the White Serbs split in two, with the half that became known as the Serbs coming down to settle Byzantine land. From 1815 to 1882, the official name for Serbia was the Principality of Serbia. From 1882 to 1918, it was renamed to the Kingdom of Serbia, later from 1945 to 1963, the official name for Serbia was the People's Republic of Serbia. This was again renamed the Socialist Republic of Serbia from 1963 to 1990. Since 1990, the official name of the country has been the Republic of Serbia. History Prehistory and antiquity Archaeological evidence of Paleolithic settlements on the territory of present-day Serbia is scarce. A fragment of a human jaw was found in Sićevo (Mala Balanica) and is believed to be up to 525,000–397,000 years old. Approximately around 6,500 years BC, during the Neolithic, the Starčevo and Vinča cultures existed in the region of modern-day Belgrade. They dominated much of Southeastern Europe (as well as parts of Central Europe and Asia Minor). Several important archaeological sites from this era, including Lepenski Vir and Vinča-Belo Brdo, still exist near the banks of the Danube. During the Iron Age, local tribes of Triballi, Dardani, and Autariatae were encountered by the Ancient Greeks during their