Niš (; , ; names in other languages), less often spelled in English as Nish, is the third largest city in Serbia and the administrative center of the Nišava District. It is located in the southern part of Serbia. , the city proper has a population of 178,976, while its administrative area has a population of 249,501 inhabitants.

Several Roman emperors were born in Niš or used it as a residence: Constantine the Great, the first Christian emperor and the founder of Constantinople, Constantius III, Constans, Vetranio, Julian, Valentinian I, Valens; and Justin I. Emperor Claudius Gothicus decisively defeated the Goths at the Battle of Naissus (present-day Niš). Later playing a prominent role in the history of the Byzantine Empire, the city's past would earn it the nickname Imperial City.

After about 400 years of Ottoman rule, the city was liberated in 1878 and became part of the Principality of Serbia, though not without great bloodshed—remnants of which can be found throughout the city. Today, Niš is one of the most important economic centers in Serbia, especially in the electronics, mechanical engineering, textile, and tobacco industries. Constantine the Great Airport is Niš's international airport. The city is also the seat of the University of Niš, the Eparchy of Niš and the Command of Serbian Army.

In 2013, the city was host to the celebration of 1,700 years of Constantine's Edict of Milan.

Name Niš was known as НишьДанчо Господинов и кол. (2003) История на града Лом и Ломска околия. Изток-Запад, , стр. 387. or Ньшь (Nyšь) in Old Serbian and Old Bulgarian. Nāissus is the ancient name of the city. Naissus is itself probably a derivative of the older *Nāviskos, from *Nāvia ("trough valley"), the Celtic name of the Nišava River, which flows through the city. In historical sources, the town is mentioned as Naissus, Ναϊσσός, Naessus, urbs Naisitana, Нишь, Ньшь, Nisso and Nix.

Niš evolved from the toponym attested in Ancient Greek as (Naissos), achieving its present form via phonetic changes in Proto-Albanian, after which the place name entered Slavic.The contemporary form of the name of ancient Naissos, an important place in Dardania which is now called Niš, is best explained with the help of the historical phonetics of the Albanian language. For more see: Vladimir I. Georgiev (1981) Introduction to the History of the Indo-European Languages. Publishing House of the Bulgarian Academy of Sciences, p. 142, . Hamp, Eric P. "Albanian" p. 1663 in Part 2, The study of languages, edited by Einar Haugen, Berlin, Boston: De Gruyter Mouton, 2019, pp. 1626-1692. https://doi.org/10.1515/9783111684970-016 Nish might indicate that Proto-Albanian was spoken in the region in pre-Slavic antiquity. According to Ismajli (2015), when this settlement happened is a matter of debate, as Proto-Albanians might have moved relatively late in antiquity in the area which might have been an eastern expansion of Proto-Albanian settlement as no other toponyms known in antiquity in the area presuppose an Albanian development. It cannot be ruled out however that the development of Nish < Naiss- may also represent a regional development in late antiquity Balkans which, while closely related to Albanian (i.e. characterized by the same phonetic system), may not have been identical to it. Attempts have been made to explain the place name in various ways as "a purely Slavic development", such as by Serbian linguist Aleksandar Loma; however, Austrian linguist Joachim Matzinger, who maintains the Albanian transmission of Naiss > Niš, states that "a discussion with historical South Slavic linguistics is an urgent desideratum".Matzinger, Joachim (2016). "Die albanische Autochthoniehypothese aus der Sicht der Sprachwissenschaft": "Es wird versucht, den Ortsnamen auf verschiedene Weise auch als rein slawische Entwicklung zu erklären, siehe Aleksandar LOMA [...] Das letzte Wort ist hier noch nicht gesprochen, eine Diskussion mit der historischen südslawischen Linguistik ist ein dringendes Desiderat!", p. 14

History

Early history

The first settlement on the site of today's Niš may have been founded by the Celts at the end of the 3rd century BC. There is, however, very little archaeological evidence that can be used to reconstruct the pre-Roman history of Niš. During the Roman era, the city of Naissus became a large urban center. During the Roman conquest of the Balkans, between 168 and 75 BC, the city was used as a base of operations. Naissus was first mentioned in Roman documents near the beginning of the 2nd century CE, and was considered a place worthy of note in the Geography of Ptolemy of Alexandria.

The Romans occupied the town during the Dardanian campaign (75–73 BC), and set up a legionary camp in the city. The city, called refugia and vici in pre-Roman relation, as a result of its strategic position (the Thracians were based to the south) developed as an important garrison and market town in the province of Moesia Superior. In 169 AD, Naissus was established as a municipium and from Diocletian onwards it belonged to the province of Dardania. In 272, the future Emperor Constantine the Great was born in Naissus. Constantine created the Dacia Mediterranea province, of which Naissus was the capital, which also included Remesiana on the Via Militaris and the towns of Pautalia and Germania. He lived in Naissus briefly from 316 to 322.Pannonia and Upper Moesia: a history of the middle Danube provinces p.51

The city was of great importance for the Constantinian dynasty. It is the birthplace of Constantine the Great who turned it from a middle-sized town to a large city with many public buildings. The city flourished greatly in the Constantinian period. A bronze bust of Constantine was erected in the city. It was his temporary residence and the city where he promulgated many laws, preserved in the Theodosian code. In Constantinian narratives, Naissus was the city where the usurper Vetranio abdicated to Constantius II after a powerful speech he gave to the rebel armies. Julian, the last Constantinian emperor, used Naissus, which had arms factories, as his base in the civil war and recruited Illyrians and others as soldiers for his campaign.

In 364 AD, the imperial Villa Mediana was the site where emperors Valentinian and Valens met and divided the Roman Empire into halves which they would rule as co-emperors.

It was besieged by the Huns in 441 and devastated in 448, and again in 480 when the partially-rebuilt town was demolished by the Barbarians. Byzantine Emperor Justinian I restored the town but it was destroyed by the Avars once again. The Slavs, in their campaign against Byzantium, conquered Niš and settled here in 540.

Middle Ages

In 805, the town and its surroundings were taken by Bulgarian Emperor Krum. In the 11th century Byzantium reclaimed control over Naissus and the surrounding area.

King Solomon of Hungary and Prince Géza marched along the valley of the river Great Morava as far as Niš. The Hungarians seized the Byzantine city without any resistance in 1072. During the People's Crusade, on 3 July 1096, Peter the Hermit clashed with Byzantine forces at Naissus. Manuel I fortified the town, but under his successor Andronikos I it was seized by the Hungarian king Béla III. Byzantine control was eventually reestablished, but in 1185 it fell under Serbian control. By 1188, Niš became the capital of Serbian king Stefan Nemanja. On 27 July 1189, Nemanja received German emperor Frederick Barbarossa and his 100,000 crusaders at Niš. Niš is mentioned in descriptions of Serbia under Vukan in 1202, highlighting its special status. In 1203, Kaloyan of Bulgaria annexed Niš. Stefan Nemanjić later regained the region.

Ottoman period The fall of the Serbian Empire, which was conquered by Ottoman Sultan Murad I in 1385, decided the fate of Niš as well. After a 25-day-long siege the city fell to the Ottomans. It was returned to Serbian rule in 1443. Niš again fell under Ottoman rule in 1448, and remained thusly for 241 years. During Ottoman rule Niš was a seat of the empire's military and civil administration. A Silesian traveler stated in 1596 that the route from Sofia to Niš was littered with corpses and described the gates of Niš as bedecked with the freshly-severed heads of poor Bulgarian peasants. In 1689, Niš was seized by the Austrian army during the Great Turkish War, but the Ottomans regained it in 1690. In 1737, Niš was again seized by the Austrians, who attempted to rebuild the fortifications around the city. The same year, the Ottomans reclaimed the city without resistance. The existing fortification is of Ottoman Turkish origin, dating from the first decades of the 18th century (1719–1723). It is well known as one of the most significant and best preserved monuments of this kind in the mid-Balkans. The Fortress was erected on the site of earlier fortifications – the ancient Roman, Byzantine, and later yet Medieval forts.

During the First Serbian uprising in 1809, Serbian revolutionaries attempted to liberate Niš in the Battle of Čegar. After the defeat of the Serbian forces, the Ottoman commander of Niš ordered the heads of the slain Serbs mounted on a tower to serve as a warning. The structure became known as Skull Tower (). In 1821, the Ottomans arrested the Bishop of Niš, Milentija, as well as 200 Serbian patriots, on charges of preparing an uprising in the Niš area in support of the Greek War of Independence. On June 13 of that year, Bishop Milentija and other Serbian leaders were hanged in public.

In the 19th century Niš was an important town, but populated by Bulgarians in the 19th century, when the Niš rebellion broke out in 1841. According to Ottoman statistics during the Tanzimat the population of Sanjak of Niš was treated as Bulgarian, and according to French travelers such as Jérôme-Adolphe Blanqui and Ami Boue in 1837/1841. According to all authors between 1840 and 1872 the delineation between Bulgarians and Serbs is undisputed and ran north of Nis, although one author Cyprien Robert claims that half of the population of the town was made up by Serbians. Serbian cartographers of the time (such as Dimitrije Davidović in 1828 and Milan Savić in 1878) also accepted South Morava river as such delineation and added Niš outside the borders of the Serbian people. In 1862 some Muslim families from Belgrade and Smederevo settled in Nis due to the forced displacement of Muslims in the Principality of Serbia. The urban population of Niš consisted of 17,107 Christian and 4,291 Muslim males, with total number of 3,500 Serbian houses and 2,000 Muslim houses. Muslim population of Niš consisted mainly of Turks, of which a part were of Albanian origin, and the rest were Muslim Albanians and Muslim Romani.

In 1870, Niš was included in the Bulgarian Exarchate. Before the area had been under the Ecumenical Patriarchate of Constantinople and the Serbian Patriarchate of Peć. The city was also stipulated the area to be ceded to Bulgaria according to the Constantinople Conference in 1876.Encyclopedia of the Ottoman Empire; Gabor Agoston, Bruce Alan Masters; 2009, p. 104