Singidunum

Singidunum (Serbian: Сингидунум) was an ancient Celtic settlement that became a major Roman fortress and later evolved into modern Belgrade, Serbia[1]. The city was founded by the Scordisci tribe in the 3rd century BC following Gallic invasions of the Balkans[1]. Rome conquered the area in 75 BC, incorporating it into the province of Moesia[1]. The fortress served as a key stronghold along the Danubian Limes, hosting Legio IV Flavia Felix from 86 AD onward[1]. It was the birthplace of Roman Emperor Jovian[1]. The settlement was sacked by Huns in 441 and by Avars and Slavs in 584, with the fort finally destroyed at the beginning of the 7th century[1].