crusader state · Greece and the Aegean

Kingdom of Thessalonica

1204 CE – 1224 CE · capital Thessalonica

Crusader kingdom created for Boniface of Montferrat after the Fourth Crusade, which lasted only twenty years before falling to Epirus.

Origins

Boniface of Montferrat, leader of the Fourth Crusade, lost the election for Latin emperor in 1204 but received Thessalonica and much of Macedonia and Thessaly. He married Margaret of Hungary, widow of Isaac II, and invaded central and southern Greece, granting fiefs such as the Duchy of Athens and the Marquisate of Bodonitsa to his followers.

Rule and society

The kingdom was ruled by Lombard nobles from northern Italy over a Greek population, under nominal homage to the Latin Empire. A Latin archbishop replaced the Orthodox metropolitan. Boniface was killed by the Bulgarians of Kaloyan in 1207, leaving his infant son Demetrius under a regency; the Lombard barons' revolt of 1208-1209 was suppressed by Emperor Henry.

Decline and legacy

Weakened by internal divisions and Bulgarian attacks, the kingdom was gradually conquered by Theodore Komnenos Doukas of Epirus, who took Thessalonica itself in 1224 and founded the Empire of Thessalonica. The title survived among Western claimants.

Connections (5)

More states of Greece and the Aegean →

Cite this page
APA
The Epoch Institute. (2026). Kingdom of Thessalonica. In The Epoch Institute States Register. https://the-epoch-institute.org/state/kingdom-of-thessalonica
MLA
“Kingdom of Thessalonica.” The Epoch Institute States Register, The Epoch Institute, 2026, https://the-epoch-institute.org/state/kingdom-of-thessalonica. Accessed .
Chicago
The Epoch Institute. “Kingdom of Thessalonica.” The Epoch Institute States Register. 2026. https://the-epoch-institute.org/state/kingdom-of-thessalonica.
Harvard
The Epoch Institute (2026) ‘Kingdom of Thessalonica’, The Epoch Institute States Register. Available at: https://the-epoch-institute.org/state/kingdom-of-thessalonica (Accessed: ).

Last reviewed October 2026Random state ↻