Kalemegdan

Belgrade Fortress
Belgrade in Serbia
Kalemegdan Park, part of the Fortress
Coordinates	44°49′24″N 020°27′01″E / 44.82333°N 20.45028°E / 44.82333; 20.45028Coordinates: 44°49′24″N 020°27′01″E / 44.82333°N 20.45028°E / 44.82333; 20.45028
Type	Fortress
Site information
Open to the public	Yes
Site history
Built	535 (535)
Built by	Justinian I
Materials	Stone

Belgrade Fortress (Serbian: Београдска тврђава / Beogradska tvrđava), consists of the old citadel (Upper and Lower Town) and Kalemegdan Park (Large and Little Kalemegdan) on the confluence of the River Sava and Danube, in an urban area of modern Belgrade, the capital of Serbia. It is located in Belgrade's municipality of Stari Grad. Belgrade Fortress was declared a Monument of Culture of Exceptional Importance in 1979, and is protected by the Republic of Serbia.

Belgrade Fortress is located on top of the 125.5-meter high ending ridge of the Šumadija geological bar. The cliff-like ridge overlooks the Great War Island (Serbian: Veliko ratno ostrvo) and the confluence of the Sava river into the Danube, and makes one of the most beautiful natural lookouts in Belgrade. It borders the neighborhoods of Dorćol (north and north-east), Stari Grad (east) and Kosančićev Venac (Savamala; south). It is encircled by three streets: Boulevard of Vojvoda Bojović, Tadeuša Košćuška, Pariska, and the railway along the riverside.

Belgrade Fortress is the core and the oldest section of the urban area of Belgrade. For centuries the city population was concentrated only within the walls of the fortress, and thus the history of the fortress, until most recent times, equals the history of Belgrade itself (see: Timeline of Belgrade history). The first mention of the city is when it was founded in the 3rd century BC as "Singidunum" by the Celtic tribe of Scordisci, who had defeated Thracian and Dacian tribes that previously lived in and around the fort. The city-fortress was later conquered by the Romans, was known as Singidunum and became a part of "the military frontier", where the Roman Empire bordered "barbarian Central Europe". Singidunum was defended by the Roman legion IV Flaviae, which built a fortified camp on a hill at the confluence of the Danube and the Sava rivers. In the period between AD 378 and 441 the Roman camp was repeatedly destroyed in the invasions by the Goths and the Huns. Legend says that Attila's grave lies at the confluence of the Sava and the Danube (under the fortress). In 476 Belgrade again became the borderline between the empires: the Western Roman Empire and Eastern Roman Empire (Byzantine Empire), and the Slav-Avar State in the north.