kingdom · Greece and the Aegean
Empire of Thessalonica
Origins
Theodore Komnenos Doukas, ruler of the Despotate of Epirus, steadily conquered the Kingdom of Thessalonica and captured the city in 1224. Around 1227 he was crowned emperor by Demetrios Chomatenos, archbishop of Ohrid, challenging the Empire of Nicaea for leadership of the Byzantine world and preparing to march on Constantinople.
Rule and society
Theodore ruled a realm stretching from the Adriatic to Thrace, with Byzantine court titles and administration, and quarrelled with Nicaea's patriarch over church authority. In 1230 he attacked Bulgaria but was defeated and captured by Ivan Asen II at Klokotnitsa and later blinded. His brother Manuel then ruled as a Bulgarian client.
Decline and legacy
Theodore regained Thessalonica for his son John, who in 1242 had to accept the lesser title of despot from John III Vatatzes. In 1246 Vatatzes took Thessalonica from John's brother Demetrios, annexing it to the Empire of Nicaea.
Lineage
On the connections map
Open the full map →Connections (2)
- Empire of Thessalonica was a vassal of Second Bulgarian Empire1230 CE – 1241 CE
- Empire of Thessalonica was conquered by Empire of Nicaea1246 CE
More states of Greece and the Aegean →
Cite this page
- APA
- The Epoch Institute. (2026). Empire of Thessalonica. In The Epoch Institute States Register. https://the-epoch-institute.org/state/empire-of-thessalonica
- MLA
- “Empire of Thessalonica.” The Epoch Institute States Register, The Epoch Institute, 2026, https://the-epoch-institute.org/state/empire-of-thessalonica. Accessed .
- Chicago
- The Epoch Institute. “Empire of Thessalonica.” The Epoch Institute States Register. 2026. https://the-epoch-institute.org/state/empire-of-thessalonica.
- Harvard
- The Epoch Institute (2026) ‘Empire of Thessalonica’, The Epoch Institute States Register. Available at: https://the-epoch-institute.org/state/empire-of-thessalonica (Accessed: ).
Last reviewed October 2026Random state ↻