The Theme of Sirmium ( el, θέμα Σιρμίου) was a
Byzantine
The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantin ...
administrative unit (
theme
Theme or themes may refer to:
* Theme (arts), the unifying subject or idea of the type of visual work
* Theme (Byzantine district), an administrative district in the Byzantine Empire governed by a Strategos
* Theme (computing), a custom graphical ...
), which existed in present-day
Serbia
Serbia (, ; Serbian: , , ), officially the Republic of Serbia (Serbian: , , ), is a landlocked country in Southeastern and Central Europe, situated at the crossroads of the Pannonian Basin and the Balkans. It shares land borders with Hung ...
,
Croatia
, image_flag = Flag of Croatia.svg
, image_coat = Coat of arms of Croatia.svg
, anthem = "Lijepa naša domovino"("Our Beautiful Homeland")
, image_map =
, map_caption =
, capit ...
and
Bosnia and Herzegovina
Bosnia and Herzegovina ( sh, / , ), abbreviated BiH () or B&H, sometimes called Bosnia–Herzegovina and often known informally as Bosnia, is a country at the crossroads of south and southeast Europe, located in the Balkans. Bosnia and ...
in the 11th century. Its capital was
Sirmium
Sirmium was a city in the Roman province of Pannonia, located on the Sava river, on the site of modern Sremska Mitrovica in the Vojvodina autonomous provice of Serbia. First mentioned in the 4th century BC and originally inhabited by Illyrians an ...
(today
Sremska Mitrovica
Sremska Mitrovica (; sr-Cyrl, Сремска Митровица, hu, Szávaszentdemeter, la, Sirmium) is a city and the administrative center of the Srem District in the autonomous province of Vojvodina, Serbia. It is situated on the left ban ...
).
Background
In the 6th century, another Byzantine province existed in this area. It was known as
Pannonia
Pannonia (, ) was a province of the Roman Empire bounded on the north and east by the Danube, coterminous westward with Noricum and upper Italy, and southward with Dalmatia and upper Moesia. Pannonia was located in the territory that is now wes ...
and also had its capital in