ORDER OF BATTLE // March 16, 1230
Battle of Klokotnitsa
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 40,000 estimated
Bulgarian Empire
20,000
Medium-confidence figure
Empire of Thessalonica
20,000
Medium-confidence figure
Battle context
The Battle of Klokotnitsa, fought in March 1230 between the Second Bulgarian Empire under Ivan Asen II and the Empire of Thessalonica under Theodore Komnenos Doukas, produced a decisive shift in the regional balance of power in South-Eastern Europe. The engagement pitted two forces of equal recorded size — 20,000 troops each — against one another, with the Bulgarian side prevailing. The outcome restored Bulgaria to primacy among the states of the Balkans and the broader southeastern European theater, a position it had previously held within the wider arc of the Byzantine–Bulgarian Wars. For the Empire of Thessalonica, the defeat represented a severe check on its ambitions as a rival successor state to Byzantium. The battle stands as one of the defining moments of the thirteenth-century phase of the Byzantine–Bulgarian conflict, confirming the Second Bulgarian Empire's dominance at a time when the region was fragmented among competing powers.
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