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==== Byzantine Empire ====
* [[March 9]] &ndash; [[Battle of Klokotnitsa]]: Byzantine forces under [[Theodore Komnenos Doukas|Theodore Komnenos]] ('''Doukas''') invade [[Second Bulgarian Empire|Bulgaria]], breaking the peace treaty with Tsar [[Ivan Asen II]]. Theodore gathers a large army, including western mercenaries. The two armies meet near the village of [[Klokotnitsa, Haskovo Province|Klokotnitsa]]. Ivan applies clever tactics and manages to surround the Byzantines. They are completely defeated, only a small force under Theodore's brother [[Manuel Doukas]] manages to escape the battlefield. Theodore is taken prisoner and is blinded. In the aftermath, Ivan quickly extends its control over most of Theodore's domains in [[Thrace]], [[Macedonia (region)|Macedonia]] and [[Albania]]. The Latin [[Duchy of Philippopolis]] and the independent principality of [[Alexius Slav]] are also captured and annexed into Bulgaria.<ref>{{The Late Medieval Balkans | page=125}}</ref>