|Provincia Pannonia Secunda|
|province of the Roman Empire|
|-||Hunnic invasions||mid-5th century|
|Today part of||Serbia, Croatia, Bosnia and Herzegovina|
The Pannonia Secunda was one of the provinces of the Roman Empire. It was formed in the year 296, during the reign of emperor Diocletian. The capital of the province was Sirmium (today Sremska Mitrovica). Pannonia Secunda included parts of present-day Serbia, Croatia, and Bosnia and Herzegovina.
Before creation of this province, its territory was part of the province Pannonia Inferior. In the year 296, Pannonia Inferior was divided into two province - Pannonia Secunda in the south and Pannonia Valeria in the north. Border between two newly established provinces was river Drava.
Capital of Pannonia Secunda, Sirmium, was also one of four capitals of the Roman Empire and several Roman emperors were born in or near this city.
In the year 314, there was a battle between two pretenders to the imperial throne, Constantius the Great and Licinius. The battle occurred in Pannonia Secunda, near the town of Cibalae. Constantius had army of 20,000 men, while Licinius had 35,000. Battle lasted during the whole day and Constantius was victorious.
Besides Sirmium, the other cities in Pannonia Secunda were:
- Mursa (today Osijek)
- Certissa (today Đakovo)
- Marsonia (today Slavonski Brod)
- Cibalae (today Vinkovci)
- Bassianae (today Donji Petrovci)
- Cuccium (today Ilok)
- Saldae (today Brčko)
- Teutoburgium (today Dalj)
Among the prefects of Pannonia Secunda:
- Petar Milošević, Arheologija i istorija Sirmijuma, Novi Sad, 2001.
- Zbornik "Vojvodina", knjiga I, Fototipsko izdanje, PROMETEJ, Novi Sad, 2008.
- Radomir Popović, Rano hrišćanstvo u Panoniji, Vojvođanski godišnjak, sveska I, Novi Sad, 1995.