Stefan Lazarević in the context of "Balšić noble family"

Zeta (Serbian Cyrillic: Зета; Albanian: Zetës; Latin: Zenta or Genta) was one of the medieval polities that existed between 1371 and 1421, whose territory encompassed parts of present-day southern Montenegro and northern Albania, ruled by the House of Balšić.

Zeta was a crown land of the Grand Principality and Kingdom of Serbia, ruled by heirs to the Serbian throne from the Nemanjić dynasty. In the mid-14th century, Zeta was divided into Upper and Lower Zeta, governed by magnates. After Stefan Dušan (r. 1331–55), his son Stefan Uroš V ruled Serbia during the fall of the Serbian Empire, through a gradual disintegration of the Empire as a result of decentralization in which provincial lords gained semi-autonomy and eventually independence. The Balšići wrestled the Zeta region in 1356–1362 when they removed the two rulers in Upper and Lower Zeta. Ruling as lords, they empowered themselves and over the decades became an important player in Balkan politics. Zeta was united into the Serbian Despotate in 1421, after Balša III abdicated and passed the rule to his uncle, Despot Stefan Lazarević (maternally a Nemanjić).

The House of Balšić (Serbian Cyrillic: Балшићи; Albanian: Balsha, Balshaj), or Balsha, were a noble family that ruled "Zeta and the coastlands" (current-day southern Montenegro and northern Albania), from 1362 to 1421, during and after the fall of the Serbian Empire. Balša, the founder, was a petty nobleman who held only one village during the rule of Emperor Dušan the Mighty (r. 1331–1355), and only after the death of the emperor, his three sons gained power in Lower Zeta after acquiring the lands of gospodin Žarko (fl. 1336–1360) under unclear circumstances, and they then expanded into Upper Zeta by murdering voivode and čelnik Đuraš Ilijić (r. 1326–1362†). Nevertheless, they were acknowledged as oblastni gospodari of Zeta in edicts of Emperor Uroš the Weak (r. 1355–1371). After the death of Uroš (1371), the family feuded with the Mrnjavčevići, who controlled Macedonia.

When the last lord of the main branch of the family, Balša III died in 1421 without an heir, his possessions were passed on to his uncle, Despot Stefan the Tall. Later that year, the Republic of Venice took advantage of Balša's death and seized the towns of Bar and Ulcinj, and some of his other territories were seized by the Ottomans and Bosnians.

Belgrade is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Plain and the Balkan Peninsula. According to the 2022 census, the population of Belgrade city proper stands at 1,197,114, its contiguous urban area has 1,298,661 inhabitants, while population of city's administrative area (which roughly corresponds to its metro area) totals 1,681,405 people. It is one of the major cities of Southeast Europe and the third-most populous city on the river Danube.

Belgrade is one of the oldest continuously inhabited cities in Europe and the world. One of the most important prehistoric cultures of Europe, the Vinča culture, evolved within the Belgrade area in the 6th millennium BC. In antiquity, Thraco-Dacians inhabited the region and, after 279 BC, Celts settled the city, naming it Singidūn. It was conquered by the Romans under the reign of Augustus and awarded Roman city rights in the mid-2nd century. It was settled by the Slavs in the 520s, and changed hands several times between the Byzantine Empire, the Frankish Empire, the Bulgarian Empire, and the Kingdom of Hungary before it became the seat of the Serbian king Stefan Dragutin in 1284. Belgrade served as capital of the Serbian Despotate during the reign of Stefan Lazarević, and then his successor Đurađ Branković returned it to the Hungarian king in 1427. Noon bells in support of the Hungarian army against the Ottoman Empire during the siege in 1456 have remained a widespread church tradition to this day. In 1521, Belgrade was conquered by the Ottomans and became the seat of the Sanjak of Smederevo. It frequently passed from Ottoman to Habsburg rule, which saw the destruction of most of the city during the Ottoman–Habsburg wars.

The Serbian Despotate (Serbian: Српска деспотовина / Srpska despotovina) was a medieval Serbian state in the first half of the 15th century. Although the Battle of Kosovo in 1389 is mistakenly considered the end of medieval Serbia, the Despotate, a successor of the Serbian Empire and Moravian Serbia, lasted for another sixty years, experiencing a cultural, economic, and political renaissance, especially during the reign of Despot Stefan Lazarević. After the death of Despot Đurađ Branković in 1456, the Despotate continued to exist for another three years before it finally fell under Ottoman rule in 1459.

After 1459, political traditions of the Serbian Despotate continued to exist in exile, in the medieval Kingdom of Hungary, with several titular despots of Serbia, who were appointed by kings of Hungary. The last titular Despot of Serbia was Pavle Bakić, who fell in the Battle of Gorjani in 1537.

Lazar Hrebeljanović (Serbian Cyrillic: Лазар Хребељановић; c. 1329 – 15 June 1389) was a medieval Serbian ruler who created the largest and most powerful state on the territory of the disintegrated Serbian Empire. Lazar's state, referred to by historians as Moravian Serbia, comprised the basins of the Great Morava, West Morava, and South Morava rivers. Lazar ruled Moravian Serbia from 1371 until his death in 1389. He sought to resurrect the Serbian Empire and place himself at its helm, claiming to be the direct successor of the Nemanjić dynasty, which went extinct in 1371 after ruling over Serbia for two centuries. Lazar's programme had the full support of the Serbian Orthodox Church, but the Serbian nobility did not recognize him as their supreme ruler. He is often referred to as Tsar Lazar Hrebeljanović (Serbian: Цар Лазар Хребељановић / Car Lazar Hrebeljanović); however, he only held the title of prince (Serbian: кнез / knez).

Lazar was killed at the Battle of Kosovo in June 1389 while leading a Christian army assembled to confront the invading Ottoman Empire, led by Sultan Murad I. The battle ended without a clear victor, with both sides enduring heavy losses. In order to protect the weakened Serbian state from the Hungarian invasion from the north, Lazar's widow, Milica, who ruled as regent for their adolescent son Stefan Lazarević, Lazar's successor, accepted Ottoman suzerainty in the summer of 1390 in exchange for a military alliance.

The House of Crnojević (Serbian Cyrillic: Црнојевић, pl. Crnojevići / Црнојевићи) was a medieval Serbian noble family that held Zeta, or parts of it; a region north of Lake Skadar corresponding to southern Montenegro and northern Albania, from 1326 to 1362 CE, then 1403 until 1515.

Its progenitor Đuraš Ilijić was the head of Upper Zeta in the Medieval Kingdom of Serbia and Empire (r. 1326–1362†), under Stefan Dečanski, Dušan the Mighty and Stefan Uroš V. Đuraš was killed in 1362 by the Balšić family, the holders of Lower Zeta (since 1360); Zeta was in the hands of the Balšići under nominal Imperial rule until 1421, when Serbian Despot Stefan Lazarević was given the province by Balša III (1403–1421). The family fought its rivals following the murder of Đuraš, and the Crnojevićs controlled Budva from 1392 until 1396, when Radič Crnojević was murdered by the Balšićs. They are mentioned again in 1403, as vassals of the Republic of Venice, taking power in their hereditary lands.