The Battle of Klokotnitsa (, Bitkata pri Klokotnitsa) occurred on 9 March 1230 near the village of Klokotnitsa (today in Haskovo Province, Bulgaria). As a result, the Second Bulgarian Empire emerged once again as the most powerful state in Eastern Europe and the power of the Despotate of Epirus faded. The battle is often considered by historians to be the luckiest and most fruitful in Bulgarian military history.