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| Pannonia Inferior | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Province of theRoman Empire | |||||||||||
| 103–3rd century | |||||||||||
Pannonia Inferior (125 AD) | |||||||||||
| Capital | Aquincum andSirmium[1] | ||||||||||
| History | |||||||||||
• Established | 103 | ||||||||||
• Reorganized | 3rd century | ||||||||||
| |||||||||||
| Today part of | Bosnia and Herzegovina Croatia Hungary Serbia | ||||||||||
Pannonia Inferior, lit.Lower Pannonia, was aprovince of theRoman Empire. Its capital wasSirmium. It was one of the border provinces on the Danube. It was formed in the year 103 AD by EmperorTrajan who divided the former province ofPannonia into two parts:Pannonia Superior and Pannonia Inferior. The province included parts of present-day states ofHungary,Serbia,Croatia, andBosnia and Herzegovina. The province was bordered to the east (across the Danube) by aSarmatian tribe—theIazyges. Later, theVandals appeared to the north-east.

Major settlements in Pannonia Inferior included:
The province was yet again split during the reign of thetetrarchs into two more provinces,Pannonia Valeria in the north, with the new provincial capital at Sopianae, andPannonia Secunda in the south withSirmium as the provincial capital. During theFrankish period, in the 9th century, the term Lower Pannonia was used to designate eastern and southern regions of Pannonia, including the SlavicPrincipality of Lower Pannonia, particularlyPosavina.