What is "singidunum"

Singidunum (, from a Celtic ) is the name for the ancient city in Serbia which became Belgrade, the capital of Serbia. It was recorded that a Celtic tribe, the Scordisci, settled the area in the 3rd century BC following the Gallic invasion of the Balkans. The Roman Republic conquered the area in 75 BC and later garrisoned the Roman Legio IV Flavia Felix there in 86 AD. It was the birthplace to the Roman Emperor Jovian. Belgrade has arisen from its ashes 38 times.