Ottoman conquest of the Balkans in the context of "Battle of Vienna"

Ottoman Serbia refers to the Ottoman period in the history of Serbia. Various regions of medieval Serbia came under Ottoman rule already at the end of the 14th century, while the Serbian Despotate fell in 1459. Northern regions of what is now the Republic of Serbia were incorporated into the Ottoman Empire during later conquests, from 1521 to 1552. Since the Habsburg expansion towards those northern regions, in 1699 and 1718, Ottoman rule was gradually reduced to Serbian territories south of the Sava and Danube rivers (1739). From 1804 to 1830, the Principality of Serbia was gradually restored, as a vassal state of the Ottoman Empire. It gained independence in 1878, and expanded into southern regions, thus reducing Ottoman control to the historical region of the Old Serbia, that was liberated in 1912, thus ending Ottoman rule in Serbian lands.

The Ottoman conquest of the Balkans was initiated in the middle of the 14th century, leding to consequent conflicts with various Serbian states. The Ottomans defeated the Serbs at the Battle of Maritsa in 1371, and again at the Battle of Kosovo in 1389, forcing several Serbian regional lords to became sultan's vassals. In 1439, the Serbian Despotate was conquered for the first time, but restored in 1444. In 1459, the Despotate was conquered again, this time finally. Similarly, the Principality of Zeta was conquered by the Ottomans for the first time in 1479, but restored in 1481, to be finally conquered in 1496. In the meantime, the Kingdom of Bosnia was conquered by the ottomans in 1463, and the Duchy of Saint Sava in 1482. Thus by the end of the 15th century, Ottoman rule was established firmly, by imposing new provincial administration in conquered lands.

The term Greater Serbia or Great Serbia (Serbian: Велика Србија, romanized: Velika Srbija) describes the Serbian nationalist and irredentist ideology of the creation of a Serb state which would incorporate all regions of traditional significance to Serbs, a South Slavic ethnic group, including regions outside modern-day Serbia that are partly populated by Serbs. The initial movement's main ideology (Pan-Serbism) was to unite all Serbs (or all territory historically ruled, seen to be populated by, or perceived to be belonging to Serbs) into one state, claiming, depending on the version, different areas of many surrounding countries, regardless of non-Serb populations present.

The Greater Serbian ideology includes claims to various territories aside from modern-day Serbia, including the whole of the former Yugoslavia except Slovenia and part of Croatia. According to Jozo Tomasevich, in some historical forms, Greater Serbian aspirations also included parts of Albania, Bulgaria, Hungary and Romania. Its inspiration comes from the medieval Serbian Empire which existed briefly in 14th-century Southeast Europe from 1346 to 1371, prior to the Ottoman conquest of the Balkans. Some territories intended to be incorporated in the Greater Serbia exceeded the boundaries of the Serbian Empire, however.

The term Vlachs (Croatian: Vlasi) was initially used in medieval Croatian and Venetian history for a Romance-speaking pastoralist community, called "Vlachs" and "Morlachs", inhabiting the mountains and lands of the Croatian Kingdom and the Republic of Venice (Venetian Dalmatia) from the early 14th century. By the end of the 15th century they were highly assimilated with the Slavs and lost their language or were at least bilingual, while some communities managed to preserve and continue to speak their language (Istro-Romanians).

Later in the 16th and 17th century with the Ottoman conquest and mass migrations, the term was primarily used for a socio-cultural and professional segment of the population rather than to an ethnicity, and referred to the mostly Slavic-speaking emigrants and refugees from Ottoman-held territories to the Habsburg Empire (such as Croatia) and the Republic of Venice (Dalmatia), mostly of Eastern Orthodox faith, and to a lesser degree, Catholic. With the nation-building in the 19th century this population played a significant part in the national ideologies in Croatia and Serbia, and according to religious confession espoused either Croat or Serb ethnicity.