Pannonia Secunda was one of the provinces of the Roman Empire. It was formed in 296 AD, during the reign of Emperor Diocletian. The capital of the province was Sirmium (today Sremska Mitrovica). Pannonia Secunda comprised parts of present-day Serbia, Croatia, and Bosnia and Herzegovina.
The capital of Pannonia Secunda, Sirmium, held a prestigious status as one of the four capitals of the Roman Empire. Notably, several Roman emperors were born in or near this city, highlighting its significance in the empire's history.
In 314 AD, a pivotal battle took place between two rival claimants to the imperial throne, Constantine the Great and Licinius, in the province of Pannonia Secunda, near the town of Cibalae. Despite being outnumbered, with an army of 20,000 men against Licinius' 35,000, Constantine emerged victorious after a fierce battle that lasted the entire day.
During the 5th century, the province was raided several times, by migrating peoples, including Huns and Goths. During the 6th century, the territory was contested between the Ostrogoths, Gepids, Langobards, Pannonian Avars, and the Byzantine Empire.
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