Sirmium (theme)
| Theme of Sirmium Σίρμιο, θέμα Σιρμίου | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Theme of Byzantine Empire | |||||||||||||||
Map of Theme Sirmium within Byzantine Empire in 1025. | |||||||||||||||
| Capital | Sirmium | ||||||||||||||
| • Type | Theme | ||||||||||||||
| Historical era | Middle Ages | ||||||||||||||
• Annexation | 1018 | ||||||||||||||
| |||||||||||||||
The Theme of Sirmium (Greek: θέμα Σιρμίου) was a Byzantine administrative unit (theme), which existed in present-day Serbia, Croatia and Bosnia and Herzegovina in the 11th and 12th centuries. Its capital was Sirmium (today Sremska Mitrovica).