Srembska Mitrovica: MRA-SRB-Sre006

Human settlement at Sirmium is attested by archeological evidence from around 5000 BC. Host from the 4^th century BC to a population of Illyrians and Celts, Sirmium fell under Roman control in the 1^st century BC and came to become the capital of the Pannonia Inferior province. Its political ascendency endured until at least the 4^th century AD, witnessed not only by its political designation but also by its large population. Its ultimate destruction came at the hands of the Avars in the late 6^th century. Remains of Sirmium’s Roman period include eight early Christian churches, numerous coins and ceramics, and a still-unexcavated hippodrome.

Source:

https://en.wikipedia.org/wiki/Sirmium                  

Further reading:

Jeremić, M. (2013). Sirmium. The Encyclopedia of ancient history.

Vickers, M. (1974). Sirmium or Thessaloniki? A critical examination of the St. Demetrius legend. Byzantinische Zeitschrift, 67(2), 337-350.

Jeremić, M. (2006). The relationship between the urban physical structures of medieval Mitrovica and Roman Sirmium. Hortus Artium Medievalium, 12, 137-161.